1. From the Division of Pharmacoepidemiology (Y.X.), Clinical Epidemiology Center, Research and Development Service (Y.X., T.C., Z.A.-A.), and the Nephrology Section, Medicine Service (Z.A.-A.), Veterans Affairs St. Louis Health Care System, the Veterans Research and Education Foundation of St. Louis (Y.X., T.C., Z.A.-A.), the Department of Medicine, Washington University School of Medicine (Z.A.-A.), and the Institute for Public Health, Washington University in St. Louis (Z.A.-A.) — all in St. Louis.