1Department of Ophthalmic Optics, Daegu Polytechnic College, Daegu;
2Department of Optometry and Vision Science, Dongnam Health College, Suwon;
3Department of Ophthalmic Optics, Busan College of Information Technology, Busan;
4Department of Ophthalmic Optics, Kundong University, Andong, Korea
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CONFLICT OF INTEREST
No potential conflict of interest relevant to this article was reported.