1. Department of Pathology and Laboratory Medicine, Nara Hospital Kinki University Faculty of Medicine, Ikoma-city 630-0293, Japan
2. Department of Otolaryngology-Head and Neck Surgery, Nara Hospital Kinki University Faculty of Medicine, Ikoma-city 630-0293, Japan
3. Department of Surgery, Kuma Hospital, Kobe-city 650-0011, Japan
4. Department of Surgery, Yamashita Thyroid and Parathyroid Clinic, Fukuoka-city 812-0034, Japan