1. Department of Otolaryngology, National Center for Child Health and Development
2. Department of Otolaryngology, Gifu Prefectural General Medical Center
3. Department of Neonatology, National Center for Child Health and Development
4. Department of Otolaryngology, Tokyo Metropolitan Ohtsuka Hospital
5. Department of Otolaryngology-Head and Neck Surgery, Sapporo Medical University
6. Department of Otolaryngology-Head and Neck Surgery, Gifu University Hospital