1. Department of Anatomy and Cell Biology, Dong-A University College of Medicine, Busan, Korea.
2. Department of Anatomy, Research Institute of Medical Science, Konkuk University School of Medicine, Seoul, Korea.
3. Department of Ophthalmology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.
4. Department of Medical Education, Hanyang University College of Medicine, Seoul, Korea.