1. Department of Otolaryngology Head and Neck surgery; Kurashiki Central Hospital; Kurashiki Okayama Japan
2. Department of Pediatrics; Ehime University Hospital; Shitsukawa To-on city Ehime Japan
3. Kurashiki Clinical Research Institute; Kurashiki Okayama Japan
4. Department of Library; Kurashiki Central Hospital; Kurashiki Okayama Japan
5. Center of Emergency and Critical Care; Kurashiki Central Hospital; Kurashiki Okayama Japan