1. Department of Ophthalmology, Chiayi Chang Gung Memorial Hospital, Chiayi, Taiwan;
2. Department of Ophthalmology, College of Medicine, Chang Gung University, Taoyuan, Taiwan.
3. Department of Ophthalmology, Chang Gung Memorial Hospital, Taoyuan, Taiwan; and
4. Department of Neurology, West Garden Hospital, Taipei, Taiwan.