1. International Agency for Research on Cancer Lyon France
2. Windhoek Central Hospital Windhoek Namibia
3. Makerere University Kampala Uganda
4. Federal Medical Centre Owerri Nigeria
5. Abia State University Teaching Hospital Aba Nigeria
6. University of North Carolina Chapel Hill North Carolina USA
7. University of Washington Seattle Washington USA
8. London School of Hygiene & Tropical Medicine London UK