1. The 1st Department of Internal Medicine, Wakayama Medical University, Wakayama, Japan
2. Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Center Research Institute, Tochigi, Japan
3. Department of Pathology, Toranomon Hospital, Tokyo 105-8470, Japan
4. Department of Neurological Surgery, Wakayama Medical University, Wakayama, Japan
5. Department of Hypothalamic and Pituitary Surgery, Toranomon Hospital, Tokyo 105-8470, Japan