Sang-Ho Lee, MD, PhDChairman, Wooridul Spine Hospital, Seoul, KoreaFounder and Honorary President, World Congress of Minimally Invasive Spinal Surgery and TechniquesClinical professor of Anatomy, Yonsei University College of medicine Junseok Bae, MDPresident and Medical DirectorDirector, Wooridul International Minimally Invasive Spine Surgery Fellowship Program Department of Neurological Surgery Chungdam Wooridul Spine Hospital, Seoul, Korea Sang-Hyep Jeon, MDPresident and Medical DirectorDepartment of Cardiovascular SurgeryBusan Wooridul Spine Hospital, Busan, Korea