1. Department of Otolaryngology, Head and Neck Surgery, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Science, Okayama, Japan
2. Okayama Kanariya Gakuen, Okayama, Japan
3. Department of Otolaryngology, Head and Neck Surgery, Kawasaki Medical Hospital, Okayama, Japan
4. Dermatology & Otolaryngology, Hayashima ENT Clinic, Okayama, Japan
5. Child Development Support Office, KIDS*FIRST, Okayama, Japan