1. BK21 Plus program, Korea University Anam Hospital, Seongbuk-gu, Seoul, Republic of Korea
2. Department of Oncology/Hematology, Korea University Anam Hospital, Seongbuk-gu, Seoul, Republic of Korea
3. Department of Pathology, Korea University Anam Hospital, Seongbuk-gu, Seoul, Republic of Korea
4. Deapartment of Radiation Cancer Research, Korea Institute of Radiological and Medical Sciences, Nowon-Gu, Seoul, Republic of Korea