1. Department of Ophthalmology, NHIC Ilsan Hospital, Gyounggi-do, Korea.
2. The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
3. Jacobs Retina Center at Shiley Eye Center, University of California, San Diego, USA.
4. Statistical Consultation and Research Center, Department of Preventive Medicine, Keck School of Medicine, University of California, Los Angeles, California, USA.
5. Yonsei Eye Clinic, Daejeon, Korea.