1. West China Hospital, Sichuan University; Chinese Cochrane Centre, Chinese Evidence-Based Medicine Centre; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041
2. Beijing University of Chinese Medicine; Centre for Evidence-Based Chinese Medicine; 11 Bei San Huan Dong Lu, Chaoyang District Beijing China 100029
3. West China Hospital, Sichuan University; Department of Ophthalmology; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041
4. West China Hospital, Sichuan University; Department of Neurology; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041