?:authorAffiliation
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[\'Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Centre, Beijing 100191, China.\', \'Department of Clinical Epidemiology and EBM, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China.\', \'National Clinical Research Center of Digestive Diseases, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China.\', \'Primary Care Unit, Department of Public Health and Primary Care, School of Clinical Medicine, University of Cambridge, Cambridge CB18RN, UK.\', \'Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton L8S4K1, Canada.\', \'Department of Respiratory and Critical Care Medicine, Peking University Third Hospital, Beijing 100191, China.\']
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