1. Department of Neurosurgery CHA Bundang Medical Center, CHA University Seongnam‐si Gyeonggi‐do Republic of Korea
2. Department of Biomedical Science CHA Bundang Medical Center, CHA University Seongnam‐si Gyeonggi‐do Republic of Korea
3. Department of Biology Lawrence University Appleton Wisconsin USA
4. Department of Dental Materials, School of Dentistry Kyung Hee University Seoul Republic of Korea
5. Department of Neurosurgery Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine Seoul Republic of Korea