Steven A. Haist, MD, MS Residency Program Director Associate Professor of Medicine Division of General Internal Medicine and Geriatrics Department of Internal Medicine University of Kentucky Medical Center Lexington, KY John B. Robbins, MD General Internist Private Practice Internal Medicine Associates Bozeman, MT Series Editor: Leonard G. Gomella, MD The Bernard W. Godwin, Jr., Professor And Chairman Department of Urology Jefferson Medical College Thomas Jefferson University Philadelphia, Pennsylvania