[1] McMaster Univ, Hlth Res Methods Evidence & Impact, 1280 Main St West, Hamilton, ON L8S 4K1, Canada
[2] Univ Basel, Basel Inst Clin Epidemiol & Biostat, Dept Clin Res, Spitalstr 12, CH-4056 Basel, Switzerland
[3] Univ Hosp Basel, Spitalstr 12, CH-4056 Basel, Switzerland
[4] Publ Hlth Fdn India, Indian Inst Publ Hlth Delhi, Plot 47,Sect 44, Gurgaon 122002, Haryana, India
[5] Chinese Univ Hong Kong, Fac Med, JC Sch Publ Hlth & Primary Care, Hong Kong, Peoples R China
[6] Michael G DeGroote Sch Med, 1280 Main St West, Hamilton, ON L8S 4K1, Canada
[7] Univ Toronto, Dept Med, 190 Elizabeth St,R Fraser Elliott Bldg 3-805, Toronto, ON M5G 2C4, Canada
[8] Beijing Univ Chinese Med, Ctr Evidence Based Chinese Med, 11 Bei San Huan Dong Lu, Beijing 100029, Peoples R China
[9] Sichuan Univ, West China Hosp, Chinese Evidence Based Med Ctr, Chengdu 610041, Sichuan, Peoples R China
[10] St Josephs Healthcare Hamilton, Biostat Unit, 50 Charlton St East, Hamilton, ON L8N 4A6, Canada
[11] McMaster Univ, Dept Med, 1200 Main St West, Hamilton, ON L8S 4L8, Canada