1Verhocff M, van der Veen EL, Rovers MM , et al. Chronic suppurative otitis media : a review [ J ] . Int. J. Pediatr. Otorhinolarvngol. 2006. 70(1) : 1 - 12.
4Zakzouk SM, Hajjaj MF. Epidemiology of chronic suppurative otitis media among Saudi children- a comparative study of two decades [ J ]. Int. J. Pediatr. Otorhinolaryngol, 2002, 62(3) : 215 -218.