[1] Faculty of Medicine, Clinical Research Institute, Universidad Nacional de Colombia, Cra 30 45-03, Bogota
[2] Technology Development Centre, Colombian Society of Anesthesiology and Resuscitation (S.C.A.R.E.), Carrera 15A 120-74, Bogota
[3] Epidemiology and Global Health, Department of Public Health and Clinical Medicine, Umeå University, Umeå
[4] Clinical Research Institute, Faculty of Medicine, Universidad Nacional de Colombia, Bogotá
[5] Bruyère Research Institute, University of Ottawa, 85 Primrose Avenue, Ottawa, K1R 7G5, ON
[6] School of Epidemiology, Public Health and Preventive Medicine, University of Ottawa, Ottawa, ON
[7] Ottawa Hospital Research Institute, Ottawa, ON
[8] Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON
[9] Clinical Epidemiology Unit, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, 1107
[10] Department of Emergency Medicine, Foothills Medical Centre, Calgary, AB
[11] MRC/CSO Social and Public Health Sciences Unit, University of Glasgow, Glasgow
[12] Sydney School of Public Health, University of Sydney, Sydney, 2006, NSW
[13] McMaster University, Hamilton, ON
[14] Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON
[15] Public Health Ufcspa, Ulbra, HTA of Conceicao Hospital, Porto Alegre
[16] Medicine Service, Birmingham VA Medical Center, Birmingham, AL
[17] Division of Epidemiology, School of Public Health, University of Alabama at Birmingham (UAB), Birmingham, AL
[18] Department of Orthopedic Surgery, Mayo Clinic, College of Medicine, Rochester, MN
[19] Department of Pediatrics, Universidad de Antioquia, Medellin
[20] Department of Medicine, McMaster University, Hamilton, ON
[21] Clinical Epidemiology Program, Department of Medicine, University of Ottawa, Ottawa