1. Division of Epidemiology, US Food and Drug Administration Center for Drug Evaluation and Research, Silver Spring, MD, USA
2. Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA
3. Division of Biometrics, US Food and Drug Administration Center for Drug Evaluation and Research, Silver Spring, MD, USA
4. Division of Pharmacovigilance, US Food and Drug Administration Center for Drug Evaluation and Research, Silver Spring, MD, USA
5. Formerly at Division of Epidemiology, US Food and Drug Administration Center for Drug Evaluation and Research, Silver Spring, MD, USA