1. From the Division of Cardiology (E.W.C.), Kaiser Permanente Medical Group, Inc, Richmond, Calif; Division of Cardiology (E.W.C., H.V.B.), University of California, San Francisco, Calif; Division of Cardiovascular Diseases (J.G.C.), Chest Pain Center and Center for Outcomes and Effectiveness Research and Education, University of Alabama at Birmingham, Birmingham, Ala; Ovation Research Group (L.S.P.), Seattle, Wash; Department of Medicine (E.D.P.), Duke University Medical Center, Durham, NC;...