1. Division of Heavy Ion Clinical Research, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
2. Department of Radiation Oncology, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
3. Department of Orthopaedic Surgery, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
4. Department of Pathology, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea