1. From the Institute for Health Research (P.M.H., T.T.T., T.M.M., D.J.P., N.M.C., J.S.R., D.J.M.), Kaiser Permanente of Colorado, Denver, Colo; Denver VA Medical Center (P.M.H., T.T.T., T.M.M., J.S.R.), Denver, Colo; the University of Colorado Denver (P.M.H., T.T.T., T.M.M., J.S.R., D.J.M.), Denver, Colo; West Los Angeles VA Medical Center (C.J.), Los Angeles, Calif; the University of Toronto (C.J.), Toronto, Canada; Institute for Clinical Evaluative Sciences (C.J.), Toronto, Canada; Western...