1. Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
2. Department of Biostatistics, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania3Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania
3. Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, South Carolina
4. School of Nursing, Duquesne University, Pittsburgh, Pennsylvania
5. Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
6. Physical Activity and Weight Management Research Center, Department of Health and Physical Activity, University of Pittsburgh, Pittsburgh, Pennsylvania