1. From the Center for D-receptor Activation Research, Massachusetts General Hospital, Harvard Medical School, Boston, MA (CAC); the Department of Ambulatory Care and Prevention, Harvard Medical School and Harvard Pilgrim Health Care, Boston, MA (SLR-S, JWR-E, KK, and MWG); the Departments of Epidemiology (CAC and JWR-E) and Nutrition (MWG), Harvard School of Public Health, Boston, MA; and the Chann