1. Prospective Clinical Study Committee of Anaplastic Thyroid Carcinoma Research Consortium of Japan, Tokyo, Japan.
2. Department of Surgical Oncology, Osaka City University Graduate School of Medicine, Osaka, Japan.
3. Department of Surgery, Ito Hospital, Tokyo, Japan.
4. Department of Surgery, Kuma Hospital, Kobe, Japan.
5. Department of Surgery, Kanaji Thyroid Hospital, Tokyo, Japan.
6. Division of Head and Neck, Cancer Institute Hospital, Tokyo, Japan.
7. Department of Surgery II, Shinshu University, Matsumoto, Japan.
8. Department of Breast and Endocrine Surgery, Kanagawa Cancer Center, Yokohama, Japan.
9. Department of Surgery, Yokohama City University, Kanagawa, Japan.
10. Department of Breast and Endocrine Surgery, Tohoku University, Sendai, Japan.
11. Department of Thyroid and Endocrinology, Fukushima Medical University School of Medicine, Fukushima, Japan.
12. Department of Otolaryngology, Tokyo Medical University, Tokyo, Japan.
13. Noguchi Thyroid Clinic and Hospital Foundation, Oita, Japan.
14. Department of Surgery, Mito Medical Center, Mito, Japan.
15. Department of Otorhinolaryngology, Japanese Red Cross Narita Hospital, Chiba, Japan.
16. Department of Breast and Endocrine Surgery, Tsukuba University, Tsukuba, Japan.
17. Department of Endocrine Surgery, Nippon Medical School, Tokyo, Japan.