1. Internal Medicine 1, Shimane University Faculty of Medicine, Izumo 693-8501, Japan
2. Endocrine Center, Division of Hypothalamic & Pituitary Surgery, Toranomon Hospital, Tokyo 105-8470, Japan
3. Department of Pathology, Toranomon Hospital, Tokyo 105-8470, Japan
4. Second Division Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan
5. Division of Neurosurgery, Department of Brain and Neurosciences, Faculty of Medicine Tottori University, Yonago 683-8504, Japan