作者单位: | [1]Department of Clinical Epidemiology and Biostatistios, McMaster University, Hamilton, ON, Canada [2]Center for Clinical Epidemiology and Evidence-Based Medicine, West China Hospital, Sichuan University, Chengdu , China [3]Basel Institute for Clinical Epidemiology and Biostatistics, University Hospital Basel, Basel, Switzedand [4]Department of Medicine, McMaster University, Hamihon, Canada [5]协和医科大学流行病学教研室, McMaster University, Hamihon, Canada |