1 School of Medicine, University of California-San Francisco, 1400 Parnassus Avenue, San Francisco, CA, USA.
2 Centre for Global Surgery, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Francie Van Zijl Drive, Tygerberg, Cape Town, 7505, South Africa.
3 Centre for Global Surgery, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Francie Van Zijl Drive, Tygerberg, Cape Town, 7505, South Africa. kchu@sun.ac.za.
4 Department of Surgery, University of Botswana, Plot 4775 Notwane Rd, Gaborone, Botswana. kchu@sun.ac.za.