1. Department of Otorhinolaryngology, College of Medicine, Dankook University, Cheonan, Korea.
2. Beckman Laser Institute Korea, Dankook University, Cheonan, Korea.
3. Medical Laser Research Center, Dankook University, Cheonan, Korea.
4. Department of Ophthalmology, College of Medicine, Dankook University, Cheonan, Korea.
5. Catholic Institute for Visual Science, College of Medicine, The Catholic University of Korea, Seoul, Korea.
6. Department of Physics, College of Natural Sciences, Dankook University, Cheonan, Korea.