1. Radiological Cancer Medicine, University of Science and Technology, Daejeon, Korea.
2. Research Center for Radiotherapy, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
3. Department of Radiation Oncology, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
4. Departement of Nuclear Engineering, Hanyang University, Seoul, Korea.
5. Department of Radiation Oncology, SoonChunHyang University Cheonan Hospital, Cheonan, Korea.