1. Institute of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
2. Nobel Eye Institute, Taipei 115, Taiwan
3. Department of Ophthalmology, Jen-Ai Hospital Dali Branch, Taichung 412, Taiwan
4. Department of Medical Research, Chung Shan Medical University Hospital, Taichung 402, Taiwan
5. Department of Medical Education, Cathay General Hospital, Taipei 106, Taiwan
6. Institute of Statistical and Information Science, National Changhua University of Education, Changhua 500, Taiwan
7. Department of Optometry, Da-Yeh University, Chunghua 515, Taiwan