1 Ophthalmology Department, The First Affiliated Hospital of Kunming Medical University, Kunming, 650032, Yunnan, China.
2 Department of Clinical Epidemiology and Evidence-Based Medicine, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Taiyuan, 030000, Shanxi, China.
3 Ophthalmology Department, The First Affiliated Hospital of Kunming Medical University, Kunming, 650032, Yunnan, China. li_yan_km@163.com.