1. Evidence-Based Medicine Center, School of Basic Medical Science, Lanzhou University, Lanzhou, Gansu, China; Key Laboratory of Evidence-Based Medicine and Knowledge Translation of Gansu Province, Lanzhou, Gansu, China; Evidence-Based Social Science Research Center, School of Public Health, Lanzhou University, Lanzhou, Gansu, China
2. The Second Clinical Medical College of Lanzhou University, Lanzhou, Gansu, China; Department of General Practice, Zhongshan Hospital, Fudan University, Shanghai, China
3. School of Journalism and Communication, Lanzhou University, Lanzhou, Gansu, China
4. Lanzhou Modern Vocational College, Lanzhou, Gansu, China