1. Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Pathology, Inje University College of Medicine, Sanggyepaik Hospital, Seoul, Korea.
4. Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
5. Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea.