1. Department of Ophthalmology and Visual Science, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
2. Department of Ophthalmology, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.
3. St. Mary's Eye Center, Seoul, Korea.
4. Department of Ophthalmology, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.