1. Department of Plastic Surgery, Georgetown University School of Medicine, MedStar Georgetown University Hospital, Washington, DC (KMR)
2. Heritage Valley Beaver Hospital, Beaver, Pennsylvania (KBH)
3. Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania (BLR)
4. Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (DKW)