1. Julius Center for Health Sciences and Primary Care; University Medical Center Utrecht, Utrecht University; Utrecht Netherlands
2. Cochrane Infectious Diseases group; Liverpool School of Tropical Medicine; Liverpool UK
3. Centre for Academic Primary Care, Bristol Medical School: Population Health Sciences; University of Bristol; Bristol UK
4. Primary Care Research Centre, Primary Care Population Sciences and Medical Education Unit, Faculty of Medicine; University of Southampton, Aldermoor Health Centre; Southampton UK
5. National Institute for Health Research University College London Hospitals Biomedical Research Centre ; London UK
6. evidENT, Ear Institute; University College London; London UK