1. Department of Ophthalmology, Taichung Veterans General Hospital, Taichung 407, Taiwan
2. School of Medicine, National Yang-Ming University, Taipei 112, Taiwan
3. Community Medicine Research Center and Institute of Public Health, National Yang-Ming University, Taipei 112, Taiwan
4. Division of Endocrinology and Metabolism, Department of Internal Medicine, Puli Branch of Taichung Veterans General Hospital, Nantou 545, Taiwan
5. Department of Exercise Health Science, National Taiwan University of Sport, Taichung 404, Taiwan