1. Department of Ophthalmology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Institute of Cognitive Science, Yonsei University, Seoul, Korea.
4. The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.