1. Division of Diabetes, Endocrinology and Metabolism, Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto 390-8621, Japan
2. Department of Neurosurgery, Shinshu University School of Medicine, Matsumoto 390-8621, Japan
3. Department of Laboratory Medicine, Shinshu University Hospital, Matsumoto 390-8621, Japan
4. Department of Thyroid and Endocrinology, Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan