Institution: | 1. Department of Biostatistics, Indiana University School of Medicine, , Indianapolis, Indiana 46202, U.S.A.;2. The Krannert Institute of Cardiology and the Division of Cardiology, Department of Medicine, Indiana University School of Medicine, , Indianapolis, Indiana 46202, U.S.A.;3. Harvard Medical School, , Boston, Massachusetts 02215, U.S.A.;4. Clinical Electrophysiology Laboratory, Beth Israel Deaconess Medical Center, , Boston, Massachusetts 02215, U.S.A. |