1. South African Medical Research Council; Alcohol, Tobacco and Other Drug Research Unit; Francie van Zyl Drive, Tygerberg, 7505, Parow Cape Town Western Cape South Africa 7505
2. Waterford Institute of Technology; Health Sciences; Cork Road Waterford Co. Waterford Ireland
3. King's College London; Florence Nightingale Faculty of Nursing and Midwifery; James Clerk Maxwell Building , Waterloo Road London UK SE1 8WA
4. South African Medical Research Council; Alcohol, Tobacco and Other Drug Research Unit; PO Box 19070 Tygerberg South Africa 7505