1. From the Section of Nephrology (T.H.J.), Department of Medicine, and the Clinical Epidemiology Unit (T.H.J., S.J., R.O., S.O.), Department of Community Health Sciences, Aga Khan University, Karachi, Pakistan; Division of Nephrology (T.H.J., A.S.L.), Department of Medicine, Tufts-New England Medical Center, Tufts University Medical School, Boston, Mass; Section of Cardiology (F.H.J., M.I.), Department of Medicine, Aga Khan University, Karachi, Pakistan; and Department of Clinical Pharmacology (N.C.),...