1. Department of Radiation Oncology, Korea Institute of Radiological and Medical Sciences, Seoul, Korea
2. Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea
3. Department of Surgery, Korea Institute of Radiological and Medical Sciences, Seoul, Korea
4. Department of Orthopedic Surgery, Korea Institute of Radiological and Medical Sciences, Seoul, Korea
5. CyberKnife Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea