1. Department of Ophthalmology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
2. Department of Ophthalmology, Wonkwang University School of Medicine, Iksan, Korea.
3. Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea.
4. Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea.
6. Department of Ophthalmology, Cheil Eye Hospital, Daegu, Korea.
7. Department of Ophthalmology, Kim's Eye Hospital, Konyang University College of Medicine, Seoul, Korea.
8. Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
9. Department of Ophthalmology, Kyungpook National University School of Medicine, Daegu, Korea.
10. Department of Ophthalmology, The Catholic University of Korea College of Medicine, Seoul, Korea.
11. Department of Ophthalmology, Kyung Hee University School of Medicine, Seoul, Korea.
12. Department of Ophthalmology, Pusan National University College of Medicine, Busan, Korea.
13. Department of Ophthalmology, Ewha Womans University School of Medicine, Seoul, Korea.
14. Division of Health and Nutrition Survey, Korea Centers for Disease Control and Prevention, Cheongju, Korea.
15. Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.