1. University of Oxford; Department of Public Health; Rosemary Rue Building Old Road Campus Headington Oxford UK OX3 7LF
2. Newcastle University; Institute of Health and Society; Badiley Clark Building Richardson Road Newcastle upon Tyne UK NE2 4AX
3. University of Oxford; Department of Public Health; Rosemary Rue Building Headington Oxford Oxfordshire UK OX3 7LF
4. The University of Melbourne; Melbourne Institute of Applied Economic and Social Research; Level 7, Alan Gilbert Building Barry Street Carlton, Melbourne VIC Australia 3053
5. University of Modena and Reggio Emilia; Department of Oncology, Hematology and Respiratory Diseases; Via del Pozzo 71 Modena Italy 41100
6. University of York; Centre for Reviews and Dissemination; York UK YO10 5DD