1. Musculoskeletal Research Unit, Translational Health Sciences, Bristol Medical School University of Bristol Bristol UK
2. SAMRC/Wits Developmental Pathways for Health Research Unit, Department of Paediatrics, School of Clinical Medicine University of the Witwatersrand Johannesburg South Africa
3. Biomedical Research and Training Institute Harare Zimbabwe
4. MRC International Statistics and Epidemiology Group, Department of Infectious Disease Epidemiology, Faculty of Epidemiology and Population Health London School of Hygiene and Tropical Medicine London UK
5. Clinical Research Department, Faculty of Infectious and Tropical Diseases London School of Hygiene and Tropical Medicine London UK
6. Division of Endocrinology, Diabetes, & Metabolism, Perelman School of Medicine University of Pennsylvania Philadelphia PA USA
7. MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt) School of Public Health, Faculty of Health Sciences, University of the Witwatersrand Johannesburg South Africa
8. Wits Donald Gordon Medical Centre, School of Clinical Medicine, Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa