1. Department of Otolaryngology-Head and Neck Surgery, Tohoku University School of Medicine
2. Department of Otolaryngology, Tohoku Kosai Hospital
3. Department of Hematology, Miyagi Cancer Center
4. Department of Head and Neck Surgery, Miyagi Cancer Center
5. Department of Clinical Lavoratory, Miyagi Cancer Center
6. Department of Otolaryngology, Tohoku Rosai Hospital