1. Queen's University Belfast; Centre for Public Health; Institute of Clinical Sciences, Block B, Royal Victoria Hospital Grosvenor Road Belfast Northern Ireland UK BT12 6BJ
2. University of Edinburgh; Usher Institute of Population Health Sciences and Informatics; Teviot Place Edinburgh UK EH8 9AG
3. University of Oxford; Oxford Clinical Trials Research Unit; Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences Windmill Road Oxford Oxfordshire UK OX3 7LD
4. University of Oxford; Sir Richard Doll Building; Old Road Campus Headington Oxford UK OX3 7LF
5. UK Cochrane Centre; National Institute for Health Research Summertown Pavilion, Middle Way Oxford Oxfordshire UK OX2 7LG