1. Department of Ophthalmology, Kaohsiung Municipal Hsiao-Kang Hospital, Kaohsiung, Taiwan; Department of Ophthalmology, Kaohsiung Medical University, Kaohsiung, Taiwan
2. Department of Ophthalmology, Kaohsiung Medical University, Kaohsiung, Taiwan
3. Department of Ophthalmology, Changhua Christian Hospital, Changhua, Taiwan
4. Department of Public Health, Kaohsiung Medical University, Kaohsiung, Taiwan