1. Department of Obstetrics and Gynecology; The Catholic University of Korea; Kyonggi-do 480-717 Korea
2. Department of Ophthalmology; Kyung Hee University; Seoul 130-701 Korea
3. Department of Orthodontics; Kyung Hee University; Seoul 130-701 Korea
4. Department of Biomedical Engineering and Healthcare Industry Research Institute; Kyung Hee University; Seoul 130-701 Korea
5. Department of Medical Engineering; Kyung Hee University; Seoul 130-701 Korea