1. Center for Pharmacoepidemiology Research and Training, Center for Clinical Epidemiology and Biostatistics, and Department of Biostatistics and Epidemiology, University of Pennsylvania Perelman School of Medicine; Philadelphia Pennsylvania USA
2. Division of Pharmacoepidemiology and Pharmacoeconomics; Department of Medicine; Brigham and Women's Hospital, Harvard Medical School; Boston Massachusetts USA
3. Division of Comparative Effectiveness and Outcomes Research; Department of Healthcare Research and Policy; Weill Cornell Medical College; New York New York USA
4. Endocrinology Service; Department of Medicine; Memorial Sloan Kettering Cancer Center; New York New York USA