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