1. Department of Ophthalmology, Dongguk University College of Medicine, Goyang, Korea.
2. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea.
3. Artificial Eye Center, Clinical Research institute Seoul National University Hospital, Seoul, Korea.
4. Valued eye clinic, Taegeon, Korea.
5. Woori eye clinic, Taegeon, Korea.
6. Korea Eye Center Hospital, Seoul, Korea.