1. School of Public Health, Medical College of Soochow University, Suzhou, China
2. Department of Ophthalmology, The Affiliated Hospital of Yunnan University, Kunming, China
3. Department of Ophthalmology, The Second People’s Hospital of Yunnan Province, Kunming, China
4. Department of Ophthalmology, The First Affiliated Hospital of Dali University, Dali, China