1. From the Division of Research (J.V.S., J.L., B.E.S., J.A.S.), Kaiser Permanente Northern California, Oakland, Calif; Institute for Health Research (H.M.T., D.J.M.), Kaiser Permanente Colorado, Denver, Colo; Denver Veterans’ Affairs Medical Center (P.M.H.), Denver, Colo; University of Colorado Denver (P.M.H.), Denver, Colo; HealthPartners Research Foundation (K.L.M., P.J.O.), Minneapolis, Minn; National Heart, Lung, and Blood Institute (L.F.), National Institutes of Health, Bethesda, Md.