1 Department of Cornea, External Disease & Refractive Surgery, HanGil Eye Hospital, Catholic Kwandong University College of Medicine, Incheon, Republic of Korea.
2 Department of Ophthalmology, College of Medicine, Hallym University, Chuncheon, Republic of Korea.
3 Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
4 Department of Ophthalmology, Prince Mohammed Medical City (PMMC), Riyadh, Saudi Arabia.