1. Division of Epidemiology II, Office of Pharmacovigilance and Epidemiology, Office of Surveillance and Epidemiology; Center for Drug Evaluation and Research, Food and Drug Administration; Silver Spring MD USA
2. Department of Population Medicine; Harvard Pilgrim Health Care Institute; Boston MA USA
3. Division of Pulmonary, Allergy and Rheumatology Products, Office of New Drugs; Center for Drug Evaluation and Research, Food and Drug Administration; Silver Spring MD USA