1. Noncommunicable Diseases Research Division, Wits Health Consortium (PTY) Ltd Johannesburg Gauteng South Africa
2. SAMRC/Wits Developmental Pathways for Health Research Unit, Department of Pediatrics, Faculty of Health SciencesUniversity of the Witwatersrand Johannesburg Gauteng South Africa
3. South Africa Medical Research Council Common Epithelial Cancers Research CentreUniversity of Witwatersrand Johannesburg Gauteng South Africa
4. Department of Surgery, Chris Hani Baragwanath Academic Hospital and Faculty of Health SciencesUniversity of Witwatersrand Johannesburg Gauteng South Africa
5. Department of Surgery, Charlotte Maxeke Johannesburg Academic Hospital and Faculty of Health SciencesUniversity of Witwatersrand Johannesburg Gauteng South Africa
6. Department of Surgery and Oncology, Inkosi Albert Luthuli Central Hospital, Durban and Ngwelezane HospitalUniversity of KwaZulu Natal Empangeni KwaZulu Natal South Africa
7. Department of Surgery and Oncology, Grey's HospitalUniversity of KwaZulu Natal Pietermaritzburg KwaZulu Natal South Africa
8. National Cancer Registry, National Health Laboratory Service Johannesburg South Africa
9. Sydney Brenner Institute for Molecular Bioscience, Faculty of Health SciencesUniversity of the Witwatersrand Johannesburg South Africa
10. Section for Environment and Radiation, International Agency for Research on Cancer Lyon France
11. Department of MedicineUniversity of Miami Miller School of Medicine Miami FL
12. Department of Epidemiology, Mailman School of Public HealthColumbia University New York NY
13. Herbert Irving Comprehensive Cancer Center, College of Physicians and SurgeonsColumbia University New York NY
14. Department of Medicine, College of Physicians and SurgeonsColumbia University New York NY
15. Division of Medical Oncology, Department of Medicine, Faculty of Health SciencesUniversity of Witwatersrand Johannesburg Gauteng South Africa