1. Xinjiang Medical University; The Eye Department of the First Affiliated Hospital; Xinjiang China
2. West China Hospital, Sichuan University; Chinese Clinical Trial Registry, Chinese Ethics Committee of Registering Clinical Trials; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041
3. London School of Hygiene & Tropical Medicine; Cochrane Eyes and Vision Group, ICEH; Keppel Street London UK WC1E 7HT
4. First Affiliated Hospital of Xinjiang Medical University; Eye Department; Xinjiang China