Affiliation: | 1. Evidence Based Social Science Research Center, School of Public Health, Lanzhou University, Lanzhou, China Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province, Lanzhou, China;2. Evidence Based Medicine Center, School of Basic Medical Sciences, Lanzhou University, Lanzhou, China;3. Research Institute for Evidence Based Rehabilitation Medicine of Gansu Province, Lanzhou, China Gansu Province Hospital Rehabilitation Center, Lanzhou, China;4. Institution of Clinical Research and Evidence Based Medicine, The Gansu Provincial Hospital, Lanzhou, China;5. Evidence Based Social Science Research Center, School of Public Health, Lanzhou University, Lanzhou, China |