1. Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Radiation Oncology, Inha University Hospital, Inha University School of Medicine, Incheon, Korea.
3. Division of Medical Oncology, Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. British Columbia Cancer Agency - Vancouver Centre, Vancouver, Canada.
5. British Columbia Cancer Agency - Centre for the North, Prince George, Canada.