1. Biomedical Research Institute, MEDIPOST Co., Ltd., Republic of Korea.
2. Department of Science Education (Biology), College of Education, Chungbuk National University, Chungcheongbuk-Do, Republic of Korea.
3. Laboratory of Radiation Cancer Biology, Korea Institute of Radiological and Medical Sciences, Seoul, Republic of Korea.
4. Department of Neurosurgery, The Catholic University of Korea, Seoul, Republic of Korea.