1. First Eye Clinic, Cheongju, Korea.
2. Department of Internal Medicine, Chungbuk National University Hospital, College of Medicine, Chungbuk National University, Cheongju, Korea.
3. Department of Health Information and Management, Chungbuk National University Hospital, College of Medicine, Chungbuk National University, Cheongju, Korea.
4. Gokseong Public Health Center, Gokseong, Korea.
5. The One Seoul Eye Clinic, Seoul, Korea.
6. Top Retina Center, Cheongju, Korea.