1. aEvidence-Based Medicine Center, School of Basic Medical Sciences, Lanzhou University, Lanzhou, China
2. bDepartments of Health Research Methods, Evidence, and Impact
3. cDepartment of Public Health and Primary Care, Academic Centre for Nursing and Midwifery, KU Leuven, Leuven, Belgium
4. dNational Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
5. eKey Laboratory of Evidence-based Medicine and Knowledge Translation of Gansu Province, Lanzhou, China
6. fDivision of Infectious Diseases, Department of Pediatrics, McMaster University, Hamilton, Ontario, Canada
7. gMedicine