1. The Eye Department of the First Affiliated Hospital; Xinjiang Medical University; Xinjiang China
2. Chinese Evidence-Based Medicine Center; West China Hospital, Sichuan University; Chengdu China
3. Chinese Clinical Trial Registry, Chinese Ethics Committee of Registering Clinical Trials; West China Hospital, Sichuan University; Chengdu China
4. Department of Obstetrics and Gynaecology; National Key Discipline and Clinical Base, Heilongjiang University of Chinese Medicine; Harbin China