Institution: | 1. Department of Risk Management and Epidemiology, Purdue Pharma L.P., , Stamford, CT, USA;2. Department of Mental Health, Johns Hopkins Bloomberg School of Public Health (Adjunct), , Baltimore, MD, USA;3. Department of Regulatory Affairs, Purdue Pharma L.P., , Stamford, CT, USA;4. Department of Clinical Biostatistics and Epidemiology, University of Pennsylvania Perelman School of Medicine (Adjunct), , Philadelphia, PA, USA |