1 Evidence-based Medicine Center, Lanzhou University, Lanzhou 730000; Key Laboratory of Evidence-based Medicine and Knowledge Translation of Gansu Province, Lanzhou 730000; Chinese GRADE Center, Lanzhou 730000, China
2 School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
3 School of law, Lanzhou University, Lanzhou 730000,, China
4 Philosophy and sociology school, Lanzhou University, Lanzhou 730000,, China
5 School of Information Science & Engineering, Lanzhou University, Lanzhou 730000,, China
6 School of Economics, Lanzhou University, Lanzhou 730000,, China
7 School of Economics Lanzhou University, Lanzhou 730000,, China
8 Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa; Department of Medicine, University of Ottawa, Ottawa,, Canada