1. Global Surgery Initiative, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
2. Tanzania Red Cross Society, Dar es Salaam, Tanzania
3. Department of Orthopaedic Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
4. Johns Hopkins Biostatistics Center, Department of Biostatistics, Johns Hopkins School of Public Health, Baltimore, MD, USA
5. Department of Anthropology, New York University, Shanghai, China
6. Ifakara Health Institute, Ifakara, Tanzania
7. Department of International Health, Johns Hopkins School of Public Health, Baltimore, MD, USA