1. Coventry University; Centre for Research in Psychology, Behaviour and Achievement; Priory Street Coventry UK CV1 5FB
2. The University of Melbourne; Department of General Practice; 200 Berkeley Street Carlton Melbourne Victoria Australia 3053
3. Queen Mary University of London; Centre for Primary Care and Public Health, Barts and The London School of Medicine and Dentistry; 58 Turner Street Whitechapel London UK E1 2AB
4. Columbia University; Department of Epidemiology, Mailman School of Public Health; Room 1613, 722 W 168 St New York NY USA 10032
5. University of Bristol; Centre for Academic Primary Care, School of Social and Community Medicine; Canynge Hall, 39 Whatley Road Bristol UK BS8 2PS
6. La Trobe University; Mother and Child Health Research; 215 Franklin Street Melbourne Victoria Australia 3000