1. Department of Pathology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
2. Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
3. Cancer Research Institute, Seoul National University, Seoul, Republic of Korea
4. Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
5. Department of Pathology and Laboratory Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA