1. From Hong Kong Chinese Medicine Clinical Study Centre, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region, People's Republic of China; Chinese Cochrane Centre and Chinese Evidence-Based Medicine Centre, Sichuan University, Sichuan, People's Republic of China; Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, People's Republic of China;
2. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Centre for Statistics in Medicine, University of Oxford, Oxford, United Kingdom; and Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada.