1. Department of Endocrinology and Metabolism, Uonuma Institute of Community Medicine, Niigata University Medical and Dental Hospital, Niigata City, Niigata, Japan
2. Department of Internal Medicine, Niigata Prefectural Tokamachi Hospital, Niigata City, Niigata, Japan
3. Department of Neurosurgery, Uonuma Institute of Community Medicine, Niigata University Medical and Dental Hospital, Niigata City, Niigata, Japan
4. Department of Neurology, Uonuma Institute of Community Medicine, Niigata University Medical and Dental Hospital, Niigata City, Niigata, Japan
5. Department of Hematology, Endocrinology and Metabolism, Niigata University Faculty of Medicine, Niigata City, Niigata, Japan