1. Departments of Radiation OncologySeverance Hospital, Yonsei University College of Medicine Seoul Republic of Korea
2. Departments of Radiation OncologyGangnam Severance Hospital, Yonsei University College of Medicine Seoul Republic of Korea
3. Internal MedicineGangnam Severance Hospital, Yonsei University College of Medicine Seoul Republic of Korea
4. Internal MedicineSeverance Hospital, Yonsei University College of Medicine Seoul Republic of Korea