1. School of Health and Related Research, The University of Sheffield, Regent Court, 30 Regent Street, Sheffield S1 4DA, UK
2. Public Health Wales, 2 Capital Quarter, Tyndall Street, Cardiff CF10 4BZ, UK
3. Public Health Agency Northern Ireland, Linenhall Street Unit, 12-22 Linenhall Street, Belfast BT2 8BS, UK
4. Division of Population Medicine, Cardiff University, Cardiff CF14 4XN, UK
5. Public Health England (Yorkshire and the Humber), Blenheim House, Duncombe Street, Leeds LS1 4PL, UK
6. NHS Borders, Borders General Hospital, Melrose, Roxburghshire TD69BS, UK