1. From the Denver Health Medical Center (P.N.P., F.A.M.), Denver, Colo; University of Colorado Denver (P.N.P., J.S.R., F.A.M.), Denver, Colo; Institute for Health Research (P.N.P., J.S.R., F.A.M.), Kaiser Permanente Colorado, Denver, Colo; Duke Clinical Research Institute (L.L., A.F.H., E.D.P.), Durham, NC; The Cleveland Clinic (N.M.A.), Cleveland, Ohio; University of California Los Angeles (G.C.F.), Los Angeles, Calif; and Denver VA Medical Center (J.S.R.), Denver, Colo.