1. Department of Education, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan 333, Taiwan
2. School of Medicine, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
3. Department of Dermatology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan 333, Taiwan
4. Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan 333, Taiwan
5. Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
6. Department of Ophthalmology, Jen-Ai Hospital Dali Branch, Taichung 412, Taiwan
7. Department of Ophthalmology, Xiamen Chang Gung Memorial Hospital, Xiamen 361000, China