1. Faculty of Health SciencesUniversity of SouthamptonSouthamptonUK
2. Centre for Primary Care and Public HealthBarts and The London School of Medicine and Dentistry, Queen Mary University of LondonLondonUK
3. Department of MedicineStroger Hospital of Cook CountyChicagoMIUSA
4. Department of EpidemiologyMailman School of Public Health, Columbia UniversityNew YorkNYUSA
5. Evaluation Department, Department for International DevelopmentLondonUK
6. Department of General PracticeThe University of MelbourneMelbourneAustralia
7. The Judith Lumley CentreLa Trobe UniversityMelbourneAustralia
8. Centre for Academic Primary CareSchool of Social and Community Medicine, University of BristolBristolUK