1 Department of Ophthalmology, Pusan National University School of Medicine, Busan 602-739, Korea ; Medical Research Institute, Pusan National University Hospital, Busan 602-739, Korea.
2 Medical Research Institute, Pusan National University Hospital, Busan 602-739, Korea ; Department of Ophthalmology, Pusan National University Yangsan Hospital, Yangsan, Gyeongsangnam-do 626-770, Korea.