1. From the Department of Biostatistics, University of Washington, Seattle, WA (RLM and RAK); the National Institutes of Health, Bethesda, MD (DEB); the Department of Public Health Sciences, Wake Forest University, Winston-Salem, NC (GLB); the Division of General Medicine and Primary Care, Beth Israel Deaconess Medical Center, Boston, MA (KJM); and the Department of Cardiology, Johns Hopkins Univers