1. Department of Neurology, Hematology, Metabolism, Endocrinology and Diabetology, Yamagata University Faculty of Medicine, Yamagata, Japan.
2. Department of Endocrinology and Diabetes Mellitus, Fukuoka University Chikushi Hospital, Chikusino, Fukuoka, Japan.
3. Department of Neurosurgery, Fukuoka University Chikushi Hospital, Chikusino, Fukuoka, Japan.
4. Department of Neurosurgery, Yamagata University Faculty of Medicine, Yamagata, Japan.
5. Department of Preventive Medicine, Kyushu University Faculty of Medical Sciences, Fukuoka, Japan.