1. Division of Epidemiology Office of Pharmacovigilance and Epidemiology, Office of Surveillance and Epidemiology, Center for Drug Evaluation and Research, Food and Drug Administration Silver Spring Maryland USA
2. Department of Population Medicine Harvard Medical School and Harvard Pilgrim Health Care Institute Boston Massachusetts USA
3. Division of Bone, Reproductive, and Urologic Products Office of New Drugs, Center for Drug Evaluation and Research, Food and Drug Administration Silver Spring Maryland USA