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