Open Access. Powered by Scholars. Published by Universities.®

Cardiology Commons™

Open Access. Powered by Scholars. Published by Universities.®

5,246 Full-Text Articles 25,225 Authors 1,789,135 Downloads 153 Institutions

All Articles in Cardiology

Faceted Search

5,246 full-text articles. Page 95 of 253.

Retrospective Analyses Of The Outcomes Among Hospitalized Liver Cirrhosis Patients With Heart Failure And Covid-19 Infection: Insight From The National Inpatient Sample, Bruce Adrian Casipit, Hussein Al-Sudani, Ahmer Khan, Emmanuel Akuna, Aman Amanullah 2023 Thomas Jefferson University

Retrospective Analyses Of The Outcomes Among Hospitalized Liver Cirrhosis Patients With Heart Failure And Covid-19 Infection: Insight From The National Inpatient Sample, Bruce Adrian Casipit, Hussein Al-Sudani, Ahmer Khan, Emmanuel Akuna, Aman Amanullah

Division of Cardiology Faculty Papers

Background: There is paucity of data regarding the impact of Coronavirus Disease 2019 (COVID-19) infection on the outcomes of hospitalized liver cirrhosis (LC) patients with heart failure (HF).

Methods: Utilizing the 2020 National Inpatient Sample (NIS) Database, we conducted a retrospective cohort study to investigate the outcomes of hospitalized LC patients with HF and COVID-19 infection, looking at its impact on in-hospital mortality, risk for acute kidney injury (AKI) and length of stay (LOS).

Results: We identified a total of 10,810 hospitalized LC patients with HF, of which 1.39 % (n = 150/10,810) had COVID-19 infection. Using a stepwise survey …


Variance In Management Of Extracorporeal Membrane Oxygenation-Associated Fibrin Sheaths At A Single Institution, Alexandra Tedesco MD, Monica Majumdar MD, Jamel P. Ortoleva MD, Christine Nayar MD, Masashi Kawabori MD, Payam Salehi MD, Ali Irshad MD 2023 Tufts Medical Center

Variance In Management Of Extracorporeal Membrane Oxygenation-Associated Fibrin Sheaths At A Single Institution, Alexandra Tedesco Md, Monica Majumdar Md, Jamel P. Ortoleva Md, Christine Nayar Md, Masashi Kawabori Md, Payam Salehi Md, Ali Irshad Md

Abington Jefferson Health Papers

Objective: Extracorporeal membrane oxygenation (ECMO) support for patients with cardiac or respiratory failure has been increasingly used by advanced critical care practitioners. The thromboembolic complications of ECMO have been extensively discussed and researched; however, research and discussion on the development, risks, and management of cannulae-associated fibrin sheaths are lacking.

Methods: Institutional review board approval was not required. We have presented three cases detailing the identifi- cation and individualized management of ECMO-associated fibrin sheaths at our institution. The three patients provided written informed consent for the report of their case details and imaging studies.

Results: Of our three patients with ECMO-associated …


Management Of Patients With Refractory Cardiogenic Shock And Cardiointestinal Syndrome With Impella 5.5 As Bridge To Decision: Case Series, Ismael A. Salas De Armas, Bindu Akkanti, Amanda Bergeron, Anju Bhardwaj, Kha Dinh, Ali Shirafkan, Jayeshkumar A. Patel, Manish K. Patel, Carlos R. Manrique Neira, Igor D. Gregoric, Biswajit Kar, Mehmet H. Akay 2023 University of Texas Health Science Center at Houston

Management Of Patients With Refractory Cardiogenic Shock And Cardiointestinal Syndrome With Impella 5.5 As Bridge To Decision: Case Series, Ismael A. Salas De Armas, Bindu Akkanti, Amanda Bergeron, Anju Bhardwaj, Kha Dinh, Ali Shirafkan, Jayeshkumar A. Patel, Manish K. Patel, Carlos R. Manrique Neira, Igor D. Gregoric, Biswajit Kar, Mehmet H. Akay

Journal of Shock and Hemodynamics

Patients with advanced heart failure require multi-system management as a majority succumb to end-organ dysfunction, including gastrointestinal sequelae. Temporizing measures, such as early mechanical circulatory support, can assist in the recovery of patients with acute cardiogenic shock. The temporary support can improve patient characteristics to enable future definitive heart failure therapies such as durable left ventricular assist devices and orthotopic heart transplantation. We present two cases of cardiogenic shock that were successfully bridged with an Impella 5.5 (Abiomed). The management enabled the patients to recover from reversible cardiointestinal syndrome and undergo successful definitive therapies.


Revascularization In Cardiogenic Shock: Residual Syntax Score And Chronic Total Occlusions, Venugopal Menon 2023 Cleveland Clinic, Cleveland, OH

Revascularization In Cardiogenic Shock: Residual Syntax Score And Chronic Total Occlusions, Venugopal Menon

Journal of Shock and Hemodynamics

The residual syntax score (rSS) is strongly associated with outcomes in patients with stable coronary artery disease. In patients with acute myocardial infarction-associated cardiogenic shock (AMI-CS), the correlation or association of the rSS, mortality risk, and revascularization strategy has not yet been elucidated and needs more investigation. The SHOCK trial demonstrated that patients with left main and severe triple-vessel disease, who underwent coronary artery bypass grafts, had improved outcomes and higher 1-year survival rates than those with initial medical stabilization. However, it is unclear which is the superior technique for achieving complete revascularization. In contrast to the SHOCK trial’s results, …


Covid-19 Induced Right Ventricular Failure And Right Ventricular Assist Device Support, Marvin Slepian M.D. 2023 University of Arizona

Covid-19 Induced Right Ventricular Failure And Right Ventricular Assist Device Support, Marvin Slepian M.D.

Journal of Shock and Hemodynamics

COVID-19, while primarily recognized for its pulmonary and systemic manifestations, afflicts the cardiovascular system through various abnormalities. Notably, right ventricular (RV) involvement leading to dysfunction and failure is a manifestation seen in up to 20% of severe COVID patients. RV severity correlates with overall COVID severity, serving as a prognostic marker. Data review reveals that RV failure was largely underdiagnosed, particularly early on in the pandemic. The therapy approach for RV failure in patients with COVID should focus on supporting overall RV perfusion pressure, maintaining sinus rhythm, optimizing RV loading conditions and contractility, and addressing anticoagulation and thrombus-related conditions. Beyond …


Right Ventricular Hemodynamics In Covid-19 Patients, Steven Hollenberg 2023 Emory University School of Medicine, Atlanta, GA

Right Ventricular Hemodynamics In Covid-19 Patients, Steven Hollenberg

Journal of Shock and Hemodynamics

The right ventricle is highly sensitive to afterload, and pulmonary compromise can increase pulmonary vascular resistance and lead to right ventricular dysfunction. Pulmonary hypertension can also be exacerbated by mechanical ventilation. Patients with COVID-19 pneumonia and respiratory failure, especially those ventilated with positive end-expiratory pressure, are prone to pulmonary hypertension. Understanding their right ventricular hemodynamics can have therapeutic and prognostic implications.


Current And Emerging Therapies For Atherosclerotic Cardiovascular Disease Risk Reduction In Hypertriglyceridemia, Reed Mszar, Sarah Bart, Alexander Sakers, Daniel Soffer, Dean G. Karalis 2023 Georgetown University

Current And Emerging Therapies For Atherosclerotic Cardiovascular Disease Risk Reduction In Hypertriglyceridemia, Reed Mszar, Sarah Bart, Alexander Sakers, Daniel Soffer, Dean G. Karalis

Division of Cardiology Faculty Papers

Hypertriglyceridemia (HTG) is a prevalent medical condition in patients with cardiometabolic risk factors and is associated with an increased risk of atherosclerotic cardiovascular disease (ASCVD), if left undiagnosed and undertreated. Current guidelines identify HTG as a risk-enhancing factor and, as a result, recommend clinical evaluation and lifestyle-based interventions to address potential secondary causes of elevated triglyceride (TG) levels. For individuals with mild to moderate HTG at risk of ASCVD, statin therapy alone or in combination with other lipid-lowering medications known to decrease ASCVD risk are guideline-endorsed. In addition to lifestyle modifications, patients with severe HTG at risk of acute pancreatitis …


Association Of Circulating Mtdna With Cvd In Hemodialysis Patients And In Vitro Effect Of Exogenous Mtdna On Cardiac Microvascular Inflammation, Zhen Fan, Ya Feng, Li Zang, Yi Guo, Xiao-Yi Zhong 2023 The Texas Medical Center Library

Association Of Circulating Mtdna With Cvd In Hemodialysis Patients And In Vitro Effect Of Exogenous Mtdna On Cardiac Microvascular Inflammation, Zhen Fan, Ya Feng, Li Zang, Yi Guo, Xiao-Yi Zhong

Faculty, Staff and Student Publications

BACKGROUND: Chronic kidney disease (CKD) patients sustain a fairly high prevalence of cardiovascular disease (CVD). Microvascular inflammation is an early manifestation of CVD, and the released mitochondrial DNA (MtDNA) has been proposed to be a crucial integrator of inflammatory signals. Herein, the aim of this study was to determine the relationship between CVD, microvessel, and circulating MtDNA in the settings of uremia.

METHODS: Forty-two maintenance hemodialysis (MHD) patients and 36 health controls were enrolled in this study. Plasma cell-free MtDNA was detected by TaqMan-based qPCR assay. CVD risk markers including high-sensitive C-reactive protein (Hs-CRP), monocyte chemoattractant protein-1 (MCP-1), fibrinogen, and …


Magnetic Resonance Imaging-Derived Microvascular Perfusion Modeling To Assess Peripheral Artery Disease, Olga A Gimnich, Tatiana Belousova, Christina M Short, Addison A Taylor, Vijay Nambi, Joel D Morrisett, Christie M Ballantyne, Jean Bismuth, Dipan J Shah, Gerd Brunner 2023 The Texas Medical Center Library

Magnetic Resonance Imaging-Derived Microvascular Perfusion Modeling To Assess Peripheral Artery Disease, Olga A Gimnich, Tatiana Belousova, Christina M Short, Addison A Taylor, Vijay Nambi, Joel D Morrisett, Christie M Ballantyne, Jean Bismuth, Dipan J Shah, Gerd Brunner

Faculty, Staff and Students Publications

Background

Computational fluid dynamics has shown good agreement with contrast‐enhanced magnetic resonance imaging measurements in cardiovascular disease applications. We have developed a biomechanical model of microvascular perfusion using contrast‐enhanced magnetic resonance imaging signal intensities derived from skeletal calf muscles to study peripheral artery disease (PAD).

Methods and Results

The computational microvascular model was used to study skeletal calf muscle perfusion in 56 individuals (36 patients with PAD, 20 matched controls). The recruited participants underwent contrast‐enhanced magnetic resonance imaging and ankle‐brachial index testing at rest and after 6‐minute treadmill walking. We have determined associations of microvascular model parameters including the transfer …


Results Of Surgical Ablation For Atrial Fibrillation In Patients With Rheumatic Heart Disease, Turki B. Albacker, Sultan Alaamro, Abdulaziz M Alhothali, Amr A Arafat, Khaled D Algarni, Ahmed Eldemerdash, Bakir M Bakir 2023 King Saud University College of Medicine

Results Of Surgical Ablation For Atrial Fibrillation In Patients With Rheumatic Heart Disease, Turki B. Albacker, Sultan Alaamro, Abdulaziz M Alhothali, Amr A Arafat, Khaled D Algarni, Ahmed Eldemerdash, Bakir M Bakir

Journal of the Saudi Heart Association

Background There is conflicting evidence regarding the success of the Maze procedure to restore sinus rhythm in patients with rheumatic heart disease. Hence, the aim of our study was to describe the results of surgical ablation for atrial fibrillation in patients with rheumatic heart disease undergoing cardiac surgery. Methods This is a retrospective study that included adult patients with rheumatic heart disease who underwent surgical ablation for atrial fibrillation. The ablation lesions were performed using monopolar radiofrequency ablation in all patients. Results Fifty-seven consecutive patients were included in the study. Cox Maze IV was performed in 44 patients (77%), while …


Association Between P2y12 Inhibitor Reloading And In-Hospital Outcomes For Patients With Non-St-Segment Elevation Acute Coronary Syndrome Already On Chronic P2y12 Receptor Inhibitors Therapy In China: Findings From The Ccc-Acs (Improving Care For Cardiovascular Disease In China-Acute Coronary Syndrome) Project, Yintang Wang, Yu Geng, Ou Zhang, Qin Xu, Yajun Xue, Boda Zhou, Ping Zhang 2023 The Texas Medical Center Library

Association Between P2y12 Inhibitor Reloading And In-Hospital Outcomes For Patients With Non-St-Segment Elevation Acute Coronary Syndrome Already On Chronic P2y12 Receptor Inhibitors Therapy In China: Findings From The Ccc-Acs (Improving Care For Cardiovascular Disease In China-Acute Coronary Syndrome) Project, Yintang Wang, Yu Geng, Ou Zhang, Qin Xu, Yajun Xue, Boda Zhou, Ping Zhang

Faculty, Staff and Student Publications

BACKGROUND: The association between P2Y12 receptor inhibitors reloading and in-hospital outcomes in non-ST-segment elevation acute coronary syndrome (NSTEACS) patients who were on chronic P2Y12 receptor inhibitors therapy remained underdetermined.

METHODS: The Improving Care for Cardiovascular Disease in China-Acute Coronary Syndrome (CCC-ACS project) is a national registry active from November 2014 to December 2019. 4790 NSTEACS patients on chronic P2Y12 receptor inhibitors therapy were included. Cox proportional hazard models, Kaplan-Meier curves, and subgroup analyses were conducted.

RESULTS: The NSTEACS patients who received reloading of P2Y12 receptor inhibitors were younger and had fewer comorbid conditions. The reloading group had a lower risk …


Coronary Flow And Unloading In Acute Myocardial Infarction Shock, Kiyo Ishikawa 2023 Icahn School of Medicine at Mount Sinai

Coronary Flow And Unloading In Acute Myocardial Infarction Shock, Kiyo Ishikawa

Journal of Shock and Hemodynamics

In patients with cardiogenic shock that undergo successful coronary intervention, there are still factors complicating myocardial recovery. There is room for improvement in coronary flow using mechanical circulatory devices, specifically by left ventricular unloading. This idea was further explored in a research study using pigs. Results showed that subjects with acute myocardial infarction who have reduced cardiac contractility and/or high diastolic pressure would benefit from support strategies targeting left ventricular unloading.


Comparison Of Premature, Extremely Premature, And Older Adults With Coronary Artery Disease In Pakistan, Waqas Ullah, Rehan Malik, Faiza Bashir, Mustafa Khan, Saud Khan, Mahboob Alam, Zainab Samad, Miguel C. Achirica, Salim S. Virani, Bashir Hanif 2023 Thomas Jefferson University, United States

Comparison Of Premature, Extremely Premature, And Older Adults With Coronary Artery Disease In Pakistan, Waqas Ullah, Rehan Malik, Faiza Bashir, Mustafa Khan, Saud Khan, Mahboob Alam, Zainab Samad, Miguel C. Achirica, Salim S. Virani, Bashir Hanif

Section of Cardiology

No abstract provided.


Novel Smad3 Variant Identified In A Patient With Familial Aortopathy Modeled Using A Zebrafish Embryo Assay, Mary Burchett Sheppard, Jeffrey D. Smith, Lisa L. Bergmann, Jakub Konrad Famulski 2023 University of Kentucky

Novel Smad3 Variant Identified In A Patient With Familial Aortopathy Modeled Using A Zebrafish Embryo Assay, Mary Burchett Sheppard, Jeffrey D. Smith, Lisa L. Bergmann, Jakub Konrad Famulski

Saha Cardiovascular Research Center Faculty Publications

In human, pathogenic variants in smad3 are one cause of familial aortopathy. We describe a novel SMAD3 variant of unknown significance (VUS), V244F, in a patient who presented with aortic root dilation, right coronary artery ectasia, abdominal aortic aneurysm, right vertebral artery atresia, and cavernoma. Determination of variant pathogenicity impacted multiple aspects of the patient’s care, including the most appropriate surgical threshold for which to recommend a valve-sparing aortic root replacement. To determine whether the newly identified SMAD3 variant, and whether SMAD3 induced aortopathy in general, can be assayed in a zebrafish embryo model, we injected smad3a mRNA into Tg[kdrl:mCherry] …


Aortic Stress Activates An Adaptive Program In Thoracic Aortic Smooth Muscle Cells That Maintains Aortic Strength And Protects Against Aneurysm And Dissection In Mice, Chen Zhang, Yanming Li, Abhijit Chakraborty, Yang Li, Kimberly R. Rebello, Pingping Ren, Wei Luo, Lin Zhang, Hong S. Lu, Lisa A. Cassis, Joseph S. Coselli, Alan Daugherty, Scott A. LeMaire, Ying H. Shen 2023 Baylor College of Medicine

Aortic Stress Activates An Adaptive Program In Thoracic Aortic Smooth Muscle Cells That Maintains Aortic Strength And Protects Against Aneurysm And Dissection In Mice, Chen Zhang, Yanming Li, Abhijit Chakraborty, Yang Li, Kimberly R. Rebello, Pingping Ren, Wei Luo, Lin Zhang, Hong S. Lu, Lisa A. Cassis, Joseph S. Coselli, Alan Daugherty, Scott A. Lemaire, Ying H. Shen

Saha Cardiovascular Research Center Faculty Publications

BACKGROUND: When aortic cells are under stress, such as increased hemodynamic pressure, they adapt to the environment by modifying their functions, allowing the aorta to maintain its strength. To understand the regulation of this adaptive response, we examined transcriptomic and epigenomic programs in aortic smooth muscle cells (SMCs) during the adaptive response to AngII (angiotensin II) infusion and determined its importance in protecting against aortic aneurysm and dissection (AAD).

METHODS: We performed single-cell RNA sequencing and single-cell sequencing assay for transposase-accessible chromatin (scATAC-seq) analyses in a mouse model of sporadic AAD induced by AngII infusion. We also examined the direct …


Early Feasibility Of Endovascular Repair Of Distal Aortic Arch Aneurysms Using Patient-Specific Single Retrograde Left Subclavian Artery Branch Stent Graft, Joshua Wong, Emanuel R Tenorio, Guilherme Lima, Marina Dias-Neto, Aidin Baghbani-Oskouei, Bernardo Mendes, Jarin Kratzberg, Laura Ocasio, Thanila A Macedo, Gustavo S Oderich 2023 The Texas Medical Center Library

Early Feasibility Of Endovascular Repair Of Distal Aortic Arch Aneurysms Using Patient-Specific Single Retrograde Left Subclavian Artery Branch Stent Graft, Joshua Wong, Emanuel R Tenorio, Guilherme Lima, Marina Dias-Neto, Aidin Baghbani-Oskouei, Bernardo Mendes, Jarin Kratzberg, Laura Ocasio, Thanila A Macedo, Gustavo S Oderich

Faculty, Staff and Student Publications

OBJECTIVE: To describe the feasibility and outcomes of endovascular repair of distal aortic arch aneurysms using a patient-specific stent graft with a pre-loaded single retrograde left subclavian artery (LSA) branch stent graft.

METHODS: We reviewed the clinical data and outcomes of consecutive patients enrolled in an ongoing prospective, non-randomized physician-sponsored investigational device exemption study to evaluate the outcomes of endovascular aortic arch repair using patient-specific arch branch stent grafts (William Cook Europe, Bjaeverskov, Denmark) between 2019 and 2022. All patients received a design with triple-wide scallop and a single retrograde LSA branch with a pre-loaded catheter.

RESULTS: There were five …


Gasdermin D Deficiency In Vascular Smooth Muscle Cells Ameliorates Abdominal Aortic Aneurysm Through Reducing Putrescine Synthesis, Jianing Gao, Yanghui Chen, Huiqing Wang, Xin Li, Ke Li, Yangkai Xu, Xianwei Xie, Yansong Guo, Nana Yang, Xinhua Zhang, Dong Ma, Hong S. Lu, Ying H. Shen, Yong Liu, Jifeng Zhang, Y. Eugene Chen, Alan Daugherty, Dao Wen Wang, Lemin Zheng 2023 Peking University

Gasdermin D Deficiency In Vascular Smooth Muscle Cells Ameliorates Abdominal Aortic Aneurysm Through Reducing Putrescine Synthesis, Jianing Gao, Yanghui Chen, Huiqing Wang, Xin Li, Ke Li, Yangkai Xu, Xianwei Xie, Yansong Guo, Nana Yang, Xinhua Zhang, Dong Ma, Hong S. Lu, Ying H. Shen, Yong Liu, Jifeng Zhang, Y. Eugene Chen, Alan Daugherty, Dao Wen Wang, Lemin Zheng

Saha Cardiovascular Research Center Faculty Publications

Abdominal aortic aneurysm (AAA) is a common vascular disease associated with significant phenotypic alterations in vascular smooth muscle cells (VSMCs). Gasdermin D (GSDMD) is a pore-forming effector of pyroptosis. In this study, the role of VSMC-specific GSDMD in the phenotypic alteration of VSMCs and AAA formation is determined. Single-cell transcriptome analyses reveal Gsdmd upregulation in aortic VSMCs in angiotensin (Ang) II-induced AAA. VSMC-specific Gsdmd deletion ameliorates Ang II-induced AAA in apolipoprotein E (ApoE)−/− mice. Using untargeted metabolomic analysis, it is found that putrescine is significantly reduced in the plasma and aortic tissues of VSMC-specific GSDMD deficient mice. High putrescine levels …


The Mechanism And Therapy Of Aortic Aneurysms, Jianing Gao, Huanhuan Cao, Gaofei Hu, Yufei Wu, Yangkai Xu, Hongtu Cui, Hong S. Lu, Lemin Zheng 2023 Peking University

The Mechanism And Therapy Of Aortic Aneurysms, Jianing Gao, Huanhuan Cao, Gaofei Hu, Yufei Wu, Yangkai Xu, Hongtu Cui, Hong S. Lu, Lemin Zheng

Saha Cardiovascular Research Center Faculty Publications

Aortic aneurysm is a chronic aortic disease affected by many factors. Although it is generally asymptomatic, it poses a significant threat to human life due to a high risk of rupture. Because of its strong concealment, it is difficult to diagnose the disease in the early stage. At present, there are no effective drugs for the treatment of aneurysms. Surgical intervention and endovascular treatment are the only therapies. Although current studies have discovered that inflammatory responses as well as the production and activation of various proteases promote aortic aneurysm, the specific mechanisms remain unclear. Researchers are further exploring the pathogenesis …


Acoustic Voice And Speech Biomarkers Of Treatment Status During Hospitalization For Acute Decompensated Heart Failure, Olivia M Murton, G William Dec, Robert E Hillman, Maulik D Majmudar, Johannes Steiner, John V Guttag, Daryush D Mehta 2023 The Texas Medical Center Library

Acoustic Voice And Speech Biomarkers Of Treatment Status During Hospitalization For Acute Decompensated Heart Failure, Olivia M Murton, G William Dec, Robert E Hillman, Maulik D Majmudar, Johannes Steiner, John V Guttag, Daryush D Mehta

Faculty, Staff and Student Publications

This study investigates acoustic voice and speech features as biomarkers for acute decompensated heart failure (ADHF), a serious escalation of heart failure symptoms including breathlessness and fatigue. ADHF-related systemic fluid accumulation in the lungs and laryngeal tissues is hypothesized to affect phonation and respiration for speech. A set of daily spoken recordings from 52 patients undergoing inpatient ADHF treatment was analyzed to identify voice and speech biomarkers for ADHF and to examine the trajectory of biomarkers during treatment. Results indicated that speakers produce more stable phonation, a more creaky voice, faster speech rates, and longer phrases after ADHF treatment compared …


Genetic Effect On Body Mass Index And Cardiovascular Disease Across Generations, Chloé Sarnowski, Matthew P Conomos, Ramachandran S Vasan, James B Meigs, Josée Dupuis, Ching-Ti Liu, Aaron Leong 2023 The Texas Medical Center Library

Genetic Effect On Body Mass Index And Cardiovascular Disease Across Generations, Chloé Sarnowski, Matthew P Conomos, Ramachandran S Vasan, James B Meigs, Josée Dupuis, Ching-Ti Liu, Aaron Leong

Faculty, Staff and Student Publications

BACKGROUND: Whether genetics contribute to the rising prevalence of obesity or its cardiovascular consequences in today's obesogenic environment remains unclear. We sought to determine whether the effects of a higher aggregate genetic burden of obesity risk on body mass index (BMI) or cardiovascular disease (CVD) differed by birth year.

METHODS: We split the FHS (Framingham Heart Study) into 4 equally sized birth cohorts (birth year before 1932, 1932 to 1946, 1947 to 1959, and after 1960). We modeled a genetic predisposition to obesity using an additive genetic risk score (GRS) of 941 BMI-associated variants and tested for GRS-birth year interaction …


Digital Commons powered by bepress