1. Department of Otorhinolaryngology, Head and Neck surgery, Tokyo Metropolitan Cancer and infectious Diseases Center Komagome Hospital
2. Department of Otorhinolaryngology, Head and Neck surgery, Tokyo Metropolitan Health and Medical Treatment Corporation Ohkubo Hospital
3. Department of Otorhinolaryngology, pediatric Otorhinolaryngology, Tokyo Women’s Medical University Yachiyo Medical Center
4. Department of Head and Neck surgery, Tokyo Medical and Dental University