1. University of Oxford; Nuffield Department of Population Health; Oxford UK
2. University of Manchester; Manchester Centre for Health Psychology; Coupland I Building Oxford Road Manchester UK M13 9PL
3. University of Oxford; Nuffield Department of Primary Care Health Sciences; 23-38 Hythe Bridge Street, 2nd floor Oxford Oxford UK OX1 2ET
4. University of Oxford; PROM Group, Nuffield Department of Population Health; Old Road Campus Oxford UK OX3 7LF
5. Agency for Health Quality and Assessment of Catalonia (AQuAS); Health Technology Assessment Department; Roc Boronat 81-95 Barcelona Spain 08005
6. IMIM-Hospital del mar; CIBER Epidemiologia y Salud Publica (CIBERESP); Barcelona Spain
7. University of Manchester; NIHR School for Primary Care Research, Manchester Academic Health Science Centre, Institute of Population Health; Manchester UK M13 9PL
8. Scientific Institute for Quality of Healthcare (IQ healthcare); Radboud University Medical Center, Radboud Institute for Health Sciences; PO Box 9101 Nijmegen Netherlands 6500HB
9. University of Oxford; Bodleian Health Care Libraries; Knowledge Centre, ORC Research Building, Old Road Campus Oxford Oxfordshire UK OX3 7DQ
10. University of Exeter Medical School; Institute of Health Research; Exeter UK EX2 4SG
11. University of Leeds; School of Sociology and Social Policy; Leeds UK LS2 9UT
12. University of Exeter Medical School; Health Services & Policy Research; Exeter UK EX1 2LU
13. University of Exeter; Peninsula CLAHRC, University of Exeter Medical School; Exeter UK EX1 2LU