1. Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Korea.
2. Pituitary Tumor Center, Severance Hospital, Seoul, Korea.
3. Yonsei Endocrine Research Institute, Yonsei University College of Medicine, Seoul, Korea.
4. Division of Endocrinology and Metabolism, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.