[1] McMaster Univ, Populat Hlth Res Inst, Hamilton, ON L8S 4L8, Canada
[2] McMaster Univ, Dept Clin Epidemiol & Biostat, Hamilton, ON, Canada
[3] McMaster Univ, Dept Med, Hamilton, ON, Canada
[4] McMaster Univ, Dept Anesthesia, Hamilton, ON, Canada
[5] McMaster Univ, Dept Surg, Hamilton, ON L8S 4L8, Canada
[6] McMaster Univ, Dept Crit Care, Hamilton, ON L8S 4L8, Canada
[7] London Hlth Sci Ctr, Dept Med, London, ON, Canada
[8] Kingston Gen Hosp, Dept Anesthesiol & Perioperat Med, Kingston, ON K7L 2V7, Canada
[9] Queens Univ, Kingston, ON, Canada
[10] Univ Western Ontario, Dept Med, Div Nephrol, London, ON, Canada
[11] Univ Manitoba, Dept Surg, Winnipeg, MB R3T 2N2, Canada
[12] Univ Alberta, Dept Med, Edmonton, AB, Canada
[13] Cleveland Clin, Dept Outcomes Res, Inst Anesthesiol, Cleveland, Qld, Australia
[14] Royal Melbourne Hosp, Dept Anaesthesia & Pain Management, Melbourne, Vic, Australia
[15] Biomed Res Inst, Iberoamer Cochrane Ctr, Barcelona, Spain
[16] Biomed Res Inst, Dept Anesthesiol, Barcelona, Spain
[17] Univ Autonoma Bucaramanga, Bogota, Colombia
[18] Fdn Cardioinfantil, Bogota, Colombia
[19] St Johns Natl Acad Hlth Sci, Dept Pharmacol, Div Clin Res & Training, Bangalore, Karnataka, India
[20] Univ KwaZulu Natal, Dept Anaesthet, Perioperat Res Grp, Nelson R Mandela Sch Med, Durban, South Africa
[21] Univ Copenhagen, Herlev Hosp, Dept Anesthesiol, DK-2730 Herlev, Denmark
[22] Inst Cardiovasc Buenos Aires, Estudios Clin Latino Amer, Buenos Aires, DF, Argentina
[23] Univ Basel Hosp, Dept Anesthesia, CH-4031 Basel, Switzerland
[24] Chinese Univ Hong Kong, Dept Anaesthesia & Intens Care, Hong Kong, Hong Kong, Peoples R China
[25] Univ N Carolina, Dept Anesthesiol, Chapel Hill, NC USA
[26] Clin Univ St Luc, Brussels, Belgium
[27] Univ Peruana Cayetano Heredia, Lima, Peru
[28] Med Univ Vienna, Dept Anesthesia & Intens Care, Vienna, Austria
[29] Shifa Int Hosp, Dept Surg, Islamabad, Pakistan
[30] Clin Santa Maria, Dept Anesthesiol, Santiago, Chile
[31] Univ Malaya, Dept Anesthesiol, Kuala Lumpur, Malaysia
[32] Hosp Coracao, Res Inst HCor, Sao Paulo, Brazil
[33] Ist Sci San Raffaele, I-20132 Milan, Italy
[34] Univ Oxford, Clin Trial Serv Unit, Oxford, England
[35] Univ Oxford, Epidemiol Studies Unit, Oxford, England
[36] George Inst Global Hlth, Sydney, NSW, Australia
[37] Univ Sydney, Sydney, NSW 2006, Australia