6[14]Seely DR,Gloyd SS,Wright AD,et al.Hearing loss prevalence and risk factors among Sierra Leonean Children.Arch Otolaryngol Head Neck Surg,1995.121:853-858.
7Bonfils P,Francois M,Avan P,et al.Spontaneous and evoked otoacoustic emission in pretem neonates.Laryngoscope,1992,102:182-186.