1. Department of Ophthalmology, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Republic of Korea
2. Department of Clinical Research Design & Evaluation, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Republic of Korea
3. Department of Ophthalmology, Seongnam Citizens Medical Center, Seongnam, Republic of Korea
4. Department of Statistics and Actuarial Science, Soongsil University, Seoul, Republic of Korea
5. Department of Biostatistics, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea