7Emery M,Weber PC.Hearing loss due to myringotomy and tubeplacement and the role of preoperative audiograms.Arch Otolaryngol Head Neck Surg,1998,124:121-124.
8Nichols P T,Ramadan H H,Wax M K,et al.Relation ship between tympanic membrane perforations and retain edventilation tubes.Arch Otolaryngo lHead Neck Surg,1998,124:417 -420.
9Suzuki M,Watanabe T,Mogi G.Clinical,bacterio-logical,and histological study of adenoids in Children.Am J Otolaryngol,1999,20:85-90.
