Affiliations

• ¹ Department of Orthopaedic Surgery, Joint Research, OLVG, 1090 HM Amsterdam, The Netherlands rwp@jointresearch.org.
• ² Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada L8S 4L8.
• ³ Division General Internal Medicine & Division of Clinical Epidemiology, University Hospitals of Geneva, CH-1211, Geneva, Switzerland.
• ⁴ Department of Medicine, University of Toronto, Toronto, Ontario, Canada M5G 2C4.
• ⁵ South Western Sydney Clinical School, UNSW Australia, Sydney NSW 2052, Australia.
• ⁶ Whitlam Orthopaedic Research Centre, Ingham Institute for Applied Medical Research, Liverpool, NSW 2170, Australia.
• ⁷ Department of Surgery, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands.
• ⁸ Orillia Soldiers' Memorial Hospital, Orillia, Ontario, Canada L3V 5W6.
• ⁹ Ottawa, Ontario, Canada.
• ¹⁰ Society for Participatory Medicine Member, USA.
• ¹¹ Kindred Northlake Hospital, Northlake, USA.
• ¹² Calgary, Alberta, Canada.
• ¹³ Institute for Clinical Epidemiology and Biostatistics, University Hospital Basel, CH-4031 Basel, Switzerland.
• ¹⁴ Oslo University Hospital, Forskningsveien 2b, Blindern 0317 Oslo, Norway.
• ¹⁵ Dutch College of General Practitioners, 3502 GE Utrecht, The Netherlands.
• ¹⁶ Department of Orthopaedic Surgery, Joint Research, OLVG, 1090 HM Amsterdam, The Netherlands.
• ¹⁷ Department of Physiotherapy, OLVG, 1090 HM Amsterdam, The Netherlands.
• ¹⁸ Trauma Research Unit Erasmus, Department of Surgery, Erasmus MC University Rotterdam, 3000 CA Rotterdam, The Netherlands.
• ¹⁹ Institute of Health and Society, Faculty of Medicine, University of Oslo, 0318 Oslo, Norway.
• ²⁰ Department of Medicine, Innlandet Hospital Trust-division, Gjøvik, Norway.