1 From the Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, PA (P.D., D.G., M.T.G.); Division of Cardiology (P.D., D.G.) and Division of Pulmonary, Allergy and Critical Care Medicine (M.T.G.), University of Pittsburgh School of Medicine, PA; and Heart and Vascular Institute, UPMC, Pittsburgh, PA (M.T.G.).
2 From the Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, PA (P.D., D.G., M.T.G.); Division of Cardiology (P.D., D.G.) and Division of Pulmonary, Allergy and Critical Care Medicine (M.T.G.), University of Pittsburgh School of Medicine, PA; and Heart and Vascular Institute, UPMC, Pittsburgh, PA (M.T.G.). gladwinmt@upmc.edu.