1. Department of Endocrinology and Diabetes, Field of Internal Medicine, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan
2. Department of Neurosurgery, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan
3. Biostatistics Section, Center for Advanced Medicine and Clinical Research, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan
4. Department of Endocrinology and Diabetes, National Hospital Organization Nagoya Medical Center, Nagoya 460-0001, Japan
5. Department of Endocrinology and Metabolism, Japanese Red Cross Nagoya Daiichi Hospital, Nagoya 453-8511, Japan