1. Michael G DeGroote Institute for Pain Research and Care; McMaster University; Hamilton Canada
2. School of Chinese Medicine; Hong Kong Baptist University; Hong Kong Special Administrative Region China
3. Evidence-Based Medicine Center, School of Basic Medical Sciences; Lanzhou University; Lanzhou China
4. Evidence-Based Social Science Research Center, School of Public Health; Lanzhou University; Lanzhou China
5. Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences; McMaster University; Hamilton Canada
6. Department of Epidemiology and Health Statistics, West China School of Public Health and West China Fourth Hospital; Sichuan University; Chengdu China
7. Department of Cardiology; Gansu Provincial Hospital; Lanzhou China