John W. Hirshfeld, Jr., MD The Cardiac Catheterization Laboratory, University of Pennsylvania Medical Center, Philadelphia
Robert L. Wilensky, MD The Cardiac Catheterization Laboratory, University of Pennsylvania Medical Center, Philadelphia
Address: John W. Hirshfeld, Jr., MD, Cardiac Catheterization Laboratory, 9.119 Founders Pavilion, University of Pennsylvania Medical Center, 3400 Spruce Street, Philadelphia, PA 19104; e-mail hirshfel@mail.med.upenn.edu