1. Department of Ophthalmology, Chang Gung Memorial Hospital, Keelung, Taiwan;
2. College of Medicine, Chang Gung University, Taoyuan, Taiwan;
3. Department of Ophthalmology, Chang Gung Memorial Hospital, Taoyuan, Taiwan;
4. Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University, New York, NY, USA