1. National Cancer Center, National Cancer Control Research Institute (NCCRI) and Hospital, Goyang, Gyeonggi
2. Department of Family Medicine, Seoul National University Hospital, Seoul
3. Cancer Research Institute, Seoul National University College of Medicine, Seoul
4. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul
5. Department of Medical Oncology and Hematology, College of Medicine, Kyung Hee University, Seoul