1. Department of Medicine and Penn Center for AIDS Research
2. Department of Biostatistics and Epidemiology and Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania and Philadelphia VA Medical Center, Philadelphia, Pennsylvania
3. Analytic Research, STATinMED Research, Dallas, Texas
4. US Outcomes Research, Merck Sharpe and Dohme Corporation, Whitehouse Station, New Jersey
5. Department of Economics, Administrative, and Social Sciences, MEF University, Istanbul, Turkey