1. Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
3. Pituitary Tumor Center, Severance Hospital, Seoul, Korea.
4. Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
5. Brain Tumor Center, Severance Hospital, Seoul, Korea.