1. School of Social & Community Medicine; University of Bristol; Bristol UK
2. Social and Mathematical Epidemiology Group; London School of Hygiene and Tropical Medicine; London UK
3. Blizard Institute; Queen Mary's University of London; London UK
4. Pennine Acute Hospitals NHS Trust; Greater Manchester UK
5. Nottingham University Hospitals NHS Trust; Nottingham UK
6. Plymouth Hospital NHS Trust; Plymouth UK
7. University of Bristol Health Trust; Bristol UK
8. University of Dundee; Dundee UK
9. Health Protection Wales; Bangor Wales UK
10. Glasgow Caledonian University; Glasgow UK
11. Health Protection Scotland; Glasgow UK
12. Public Health England; London UK
13. University of Nottingham; Nottingham UK
14. MRC Biostatistics Unit; Cambridge UK