1 Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada.
2 Department of Medicine, University of Toronto, Toronto, Ontario, Canada.
3 Whitlam Orthopaedic Research Centre, Ingham Institute for Applied Medical Research, Liverpool, Australia.
4 South Western Sydney Clinical School, UNSW, Australia.
5 Division General Internal Medicine & Division of Clinical Epidemiology, University Hospitals of Geneva, Geneva, Switzerland.
6 Department of Orthopaedic Surgery, Joint Research, OLVG, Amsterdam, The Netherlands.
7 Faculty of Dentistry, Universidad de Chile, Independencia, Santiago, Chile.
8 Norwegian Institute of Public Health, Nydalen, Oslo, Norway.
9 Department of Epidemiology and Preventive Medicine, School of Public Health & Preventive Medicine, Monash University, Melbourne, Victoria, Australia.
10 Monash Department of Clinical Epidemiology, Cabrini Institute, Malvern, Victoria, Australia.
11 Clinical Epidemiology Unit, Orthopaedics, Department of Clinical Sciences Lund Faculty of Medicine, Lund University, Lund, Sweden.
12 Oslo University Hospital, Olso, Norway.
13 Richmond, Virginia, USA.
14 Clinical Effectiveness Research Group, Institute of Health and Society, University of Oslo, Oslo, Norway.
15 University Hospital North Norway, Tromso, Norway.
16 Department of Occupational Therapy, Physiotherapy and Radiography, Faculty of Health and Social sciences, Bergen University College, Bergen, Norway.
17 BMJ Editorial, BMA House, London, UK.
18 Nuffield Orthopaedic Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK.
19 London, Ontario, Canada.
20 Ingersoll, Ontario, Canada.
21 Department of Health and Science, University of Oslo, Oslo, Norway.
22 Department of Medicine, Hospital Innlandet Trust, Gjøvik, Norway.