1. From the Department of Family Medicine, Chi Mei Medical Center, Tainan 710, Taiwan
2. Department of Ophthalmology, Chi Mei Medical Center, Tainan 710, Taiwan
3. School of Pharmacy & Institute of Clinical Pharmacy and Pharmaceutical Sciences, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan
4. Department of Optometry, Chung Hwa University of Medical Technology, Tainan 717, Taiwan