2Cassano P, Gelardi M, Cassano M, et al. Adenoid tissue rhinopharyngeal obstruction grading based on fiberendoscopic findings: a novel approach to therapeutic management. Int J PediatrOtorhinolaryngol, 2003, 67: 1303-1309.
3Proctor B. Embryology and anatomy of the eustachian tube. Arch Otolaryngol, 1967, 86: 503-514.
