1. Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou, Taoyuan 333, Taiwan
2. Department of Medicine, Chang Gung University College of Medicine, Taoyuan 333, Taiwan
3. Center for Tissue Engineering, Chang Gung Memorial Hospital, Linkou, Taoyuan 333, Taiwan
4. Institute of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
5. Nobel Eye Institute, Taipei 115, Taiwan
6. Department of Ophthalmology, Jen-Ai Hospital Dali Branch, Taichung 412, Taiwan
7. Department of Medical Education, Cathay General Hospital, Taipei 106, Taiwan
8. Department of Medical Research, Chung Shan Medical University Hospital, Taichung 402, Taiwan
9. Department of Optometry, Da-Yeh University, Chunghua 515, Taiwan