1. Department of Population Health; London School of Hygiene and Tropical Medicine; London UK
2. MRC Unit, The Gambia and MRC International Nutrition Group; London School of Hygiene and Tropical Medicine; London UK
3. Department of Epidemiology, Human Genetics and Environmental Sciences; The University of Texas Health Science Center at Houston, School of Public Health; Houston USA
4. Division of Epidemiology and Community Health, School of Public Health; University of Minnesota; Minneapolis USA
5. School of Sport, Exercise and Health Sciences; Loughborough University; Loughborough UK