1. Department of Nephrology, Rheumatology, Endocrinology and Metabolism Dentistry and Pharmaceutical Sciences Okayama University Graduate School of Medicine Okayama Japan
2. Division of Endocrinology and Metabolism Hiroshima Red Cross Hospital and Atomic‐bomb Survivors Hospital Hiroshima Japan
3. Department of Primary Care and Medical Education Dentistry and Pharmaceutical Sciences Okayama University Graduate School of Medicine Okayama Japan
4. Diabetes Center Okayama University Hospital Okayama Japan
5. Department of Otolaryngology‐Head and Neck Surgery Dentistry and Pharmaceutical Sciences Okayama University Graduate School of Medicine Okayama Japan
6. Minimally Invasive Therapy Center Okayama University Hospital Okayama Japan