University of Pittsburgh - Division of Endocrinology & Metabolism, University of Pittsburgh - Division of Endocrinology & Metabolism, Baylor College of Medicine - Division of Diabetes, Baylor College of Medicine - Division of Biostatistics, University of Pittsburgh - Division of Endocrinology & Metabolism, University of Pittsburgh - Vascular Medicine Institute, University of Pittsburgh - Division of Endocrinology & Metabolism, University of Pittsburgh - Division of Endocrinology & Metabolism, University of Pittsburgh - Division of Endocrinology & Metabolism, Baylor College of Medicine - Division of Diabetes, Houston Methodist Hospital - Department of Surgery, Baylor College of Medicine - Division of Biostatistics, Baylor University - Department of Molecular and Cellular Biology, University of California, Los Angeles (UCLA) - Department of Neurobiology, Physiology and Behavior, Alleghany General Hospital - Alleghany Singer Research Institute, City of Hope - Department of Diabetes Complications and Metabolism, University of Pittsburgh - Vascular Medicine Institute and University of Pittsburgh - Division of Endocrinology & Metabolism