1. University of East Anglia; School of Medicine, Health Policy & Practice; Norwich UK NR4 7TJ
2. North Swindon District Centre; Swindon Primary Care Trust; Thamesdown Drive Swindon Wiltshire UK SN25 4AN
3. University of Bristol; Department of Social Medicine; Oakfield House Oakfield Grove, Clifton Bristol UK BS8 2BN
4. London School of Hygiene & Tropical Medicine; Department of Epidemiology & Population Health; Keppel Street London UK WC1E 7HT