1. Department of Ophthalmology Tianjin Medical University General Hospital Tianjin China
2. Department of Epidemiology and Statistics School of Public Health Tianjin Medical University Tianjin China
3. Department of Ophthalmology The People’s Hospital of Jizhou District Tianjin China
4. Department of Ophthalmology Binhai Hospital of Tianjin Medical University General Hospital Tianjin China
5. Department of Ophthalmology Jinghai Hospital Tianjin China
6. Department of Ophthalmology Tianjin Haibin People’s Hospital Tianjin China
7. Department of Ophthalmology The People’s Hospital of Wuqing District Tianjin China