1. Michael G. DeGroote Institute for Pain Research and Care, McMaster University, Hamilton, Ontario, Canada
2. Department of Anesthesia, McMaster University, Hamilton, Ontario, Canada
3. Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada
4. Michael G. DeGroote Centre for Medicinal Cannabis Research, McMaster University, Hamilton, Ontario, Canada
5. Chinese Cochrane Centre, West China Hospital, Sichuan University, Chengdu
6. Faculty of Medicine, Ain Shams University, Cairo, Egypt
7. Department of Family Medicine, McMaster University, Hamilton, Ontario, Canada
8. Krembil Research Institute, University Health Network, University of Toronto, Toronto, Ontario, Canada
9. Now with the Canadian Agency for Drugs and Technologies in Health (CADTH), Toronto, Ontario, Canada
10. Pharmaceutical Science, University of Sorocaba, Sao Paulo, Brazil
11. Leonardo Hirslanden Klinik Birshof, Münchenstein, Switzerland
12. Michael G. DeGroote School of Medicine, McMaster University, Hamilton, Ontario, Canada
13. Department of Internal Medicine, Hospital Alemán de Buenos Aires, Buenos Aires, Argentina
14. Department of Anesthesiology and Pain Medicine, University of Ottawa, Ottawa, Ontario, Canada
15. Department of Anesthesiology, Perioperative and Pain Medicine, University of Calgary, Calgary, Alberta, Canada
16. Department of Family Medicine, Max Rady College of Medicine, University of Manitoba, Winnipeg, Canada
17. Department of Anesthesia, University of Toronto, Toronto, Ontario, Canada
18. Department of Medicine, University of Toronto, Toronto, Ontario, Canada
19. Accident and Emergency Department, Queen Mary Hospital, Pokfulam, Hong Kong, China
20. Accident and Emergency Department, Tuen Mun Hospital, Hong Kong, China
21. Department of Medicine, Gjøvik, Innlandet Hospital Trust, Norway
22. Department of Hygiene and Dietetics, Faculty of Medicine, Jagiellonian University Medical College, Krakow, Poland
23. Institute for Clinical Epidemiology and Biostatistics, University of Basel Hospital, Basel, Switzerland
24. Department of Clinical Research, University of Basel Hospital, Basel, Switzerland.
25. Department of Anesthesiology, Operative Intensive Care, Preclinical Emergency Medicine and Pain Management, University of Basel Hospital, Basel, Switzerland
26. Isfahan Medical Education Research Centre, Isfahan University of Medical Sciences, Isfahan, Iran
27. Canadian Academy of Osteopathy, Hamilton, Ontario, Canada
28. Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
29. Department of Community Health and Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada
30. Department of Outcomes Research, Anesthesiology Institute, Cleveland Clinic, Cleveland, Ohio