1. Warwick Medical School, University of Warwick; Division of Health Sciences; Coventry UK CV4 7AL
2. University of Bristol; c/o Department of Social Medicine; Canynge Hall Whiteladies Road Bristol UK BS8 2PR
3. University of Bristol; Department of Social Medicine; Canynge Hall 39 Whatley Road Bristol UK BS8 2PS
4. London School of Hygiene and Tropical Medicine; Department of Non-communicable Disease Epidemiology; Keppel Street London UK WC1E 7HT