1. From the School of Pharmacy (H.V.N.), Memorial University of Newfoundland, St. John's, Newfoundland & Labrador; College of Pharmacy (S.M.), University of Manitoba, Winnipeg, Canada; Department of Neurology (D.S.K.), Mayo Clinic College of Medicine, Rochester, MN; Center for Drug Safety and Effectiveness (G.C.A.), and Department of Epidemiology (G.C.A.), Johns Hopkins Bloomberg School of Public Health; and Division of General Internal Medicine (G.C.A.), Johns Hopkins Medicine, Baltimore, MD.