1. Department of Internal Medicine, Division of Diabetes, Endocrinology and Metabolism, Hyogo College of Medicine, Mukogawa-cho, Nishinomiya, Hyogo, Japan
2. Department of Otorhinolaryngology-Head and Neck Surgery, Hyogo College of Medicine, Mukogawa-cho, Nishinomiya, Hyogo, Japan
3. Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto, Japan
4. Department of Surgical Pathology, Hyogo College of Medicine, Mukogawa-cho, Nishinomiya, Hyogo, Japan