1. Primary Care Clinical Sciences; University of Birmingham; UK
2. Primary Care Unit, Department of Public Health & Primary Care, Strangeways Research Laboratory, Wort's Causeway; University of Cambridge; Cambridge CB1 8RN UK
3. Centre for Research in Evidence Based Practice; Bond University; Australia
4. Health Economics Unit; University of Birmingham; UK
5. National Heart & Lung Institute; Imperial College London (Royal Brompton Hospital); London UK
6. Department of Primary Health Care; University of Oxford; UK
7. Public Health, Epidemiology and Biostatistics; University of Birmingham; UK
8. Department of Medicine; The University of Auckland; New Zealand
9. Julius Center for Health Sciences and Primary Care; University Medical Center Utrecht; The Netherlands