4Ho W K, Wei W I, Yuen A P, et al. Otorrhea after grommet insertion for middle ear effusion in patients with nasopharyngeal carcinoma. Am J Otolaryngol, 1999,20:12-15.
5Young Y H, Lin K L,Ko J Y. Otitis media with effusion in patients with nasopharyngeal carcinoma postirradiation. Arch Otolaryngol Head Neck Surg, 1995, 121 :765-768.
6Young Y H, Lin K L,Ko J Y. Otitis media with effu sion in patients with nasopharyngeal carcinoma postirradiation. Arch Otolaryngol Head Neck Surg, 1995,121:765-768.
7Ho W K, Wei W I, Yuen A P,et al. Otorrhea after grommet insertion for middle ear effusion in patients with nasopharyngeal carcinoma. Am J Otolaryngol,1999,20:12-15.
8Sorensen CH,Holm-Jensen S,Tos M.The post-winter prevalence rate of middle ear effusion in four-year-old children,judged by tympanometry.Int J Pediatr Otorhinolaryngol,1981,3:119-128.
9Moller H,Tos M.Point and period prevalence of otitis media with effusion evaluated by daily tympanometry.J Laryngol Otol,1990,104:937-941.
10Virolainen E,Puhakka H,Aantaa E,et al.Prevalence of secretory otitis media in seven to eight years old school children.Ann Otol Rhinol Laryngol Suppl,1980,89(3 Pt 2):7-10.
