1. From the Division of Pulmonary, Allergy, and Critical Care Medicine (S.J., D.J.L., T.A., M.P., P.A.F.) and Division of Cardiology (P.C.C.), Columbia University College of Physicians and Surgeons, New York, NY, and Section of Cardiology, Tulane University School of Medicine, New Orleans, La (T.H.L.J.).