1. Section of Environment and Radiation; International Agency for Research on Cancer (IARC); Lyon France
2. School of Public Health; Moi University; Eldoret Kenya
3. Kilimanjaro Clinical Research Institute; Moshi Tanzania
4. College of Medicine, University of Malawi; Blantyre Malawi
5. Malawi Cancer Registry; Malawi
6. National Cancer Institute, University of Gezira; Sudan
7. Faculty of Science; University of Hafr Al Batin; Saudi Arabia
8. Radiotherapy Center; Addis-Ababa-University; Addis Ababa Ethiopia
9. School of Environmental Studies; University of Eldoret; Kenya
10. Inorganic Chemistry, Centre for Environmental Geochemistry; British Geological Survey; Nottingham United Kingdom
11. Kilimanjaro Christian Medical Centre; Moshi Tanzania
12. Division of Cancer Epidemiology and Genetics; National Cancer Institute; Bethesda MD