1. Teesside University; Health and Social Care Institute; Middlesbrough UK TS1 3BA
2. Durham University Queen's Campus; School of Medicine, Pharmacy and Health; Durham UK TS17 6BH
3. Warwick Medical School, University of Warwick; Division of Health Sciences; Coventry UK CV4 7AL
4. School of Medicine, University of São Paulo; Department of Preventive Medicine; São Paulo Brazil CEP 01246 903
5. University Medical Centre Groningen; Department of Epidemiology; Hanzeplein 1 Groningen Netherlands 9713 GZ
6. The University of Sydney; Department of Paediatrics and Child Health; Locked Bag 4001 Westmead Australia NSW 2145
7. Institute of General Practice, Medical Faculty of the Heinrich-Heine-University Düsseldorf; Cochrane Metabolic and Endocrine Disorders Group; Moorenstr. 5 Düsseldorf Germany 40225
8. The World Health Organization; Geneva Switzerland