London School of Hygiene & Tropical Medicine, World Health Organization (WHO) - Section of Environment and Radiation, University of the Witwatersrand, University of the Witwatersrand, Juravinski Hospital - Cancer Centre, Makerere University, University of North Carolina (UNC) at Chapel Hill, University of Washington, Federal Medical Centre, Abia State University, Abia State University, Fred Hutchinson Cancer Research Center, World Health Organization (WHO) - International Agency for Research on Cancer (IARC), World Health Organization (WHO) - International Agency for Research on Cancer (IARC), World Health Organization (WHO) - International Agency for Research on Cancer (IARC) and London School of Hygiene & Tropical Medicine