Department of Diagnostic Pathology, Kuma Hospital, Kobe, Japan

Department of Endocrine Surgery, Nippon Medical School, Tokyo, Japan

Department of Pathology and Laboratory Medicine, Nara Hospital Kindai University Faculty of Medicine, Ikoma, Japan

Department of Pathology and Laboratory Medicine, Omori Red Cross Hospital, Tokyo, Japan

Department of Surgery, Kuma Hospital, Kobe, Japan

Department of Surgery, Ito Hospital, Tokyo, Japan

Division of Head and Neck, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan

Surgical Unit, Kojin Hospital, Morioka, Japan

Department of Head and Neck Oncology, National Cancer Center Hospital, Tokyo, Japan

Department of Head and Neck Surgery, Aichi Cancer Center Hospital, Nagoya, Japan

Division of Breast and Endocrine Surgery, Department of Surgery, Aichi Medical University, Nagakute, Japan

Department of Surgical Oncology, Osaka City University Graduate School of Medicine, Osaka, Japan

Department of Otolaryngology, Head and Neck Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan

Department of Surgery, Kanaji Thyroid Hospital, Tokyo, Japan

Department of Breast and Endocrine Surgery, Tohoku University Hospital, Sendai, Japan

Department of Otolaryngology, Ise Red Cross Hospital, Ise, Japan