1. From the Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, Maryland; the2Department of Ophthalmology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand; and the
2. From the Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, Maryland; the
3. Department of Military and Community Medicine, Phramongkutklao College of Medicine, Bangkok, Thailand.