Institution: | ? Division of Cardiology, Electrophysiology Section, UCSF Medical Center, San Francisco California † Department of Epidemiology and Biostatistics, UCSF Medical Center, San Francisco California ‡ Madras Medical Mission, Chennai, Tamil Nadu, India § John Hopkins University, Baltimore, Maryland ∥ Good Samaritan Hospital, Los Angeles, California ¶ University of Arizona, Sarver Heart Center, Tucson, Arizona # University of Rochester, Rochester, New York |