http://reply.papertrans.cn/2/140/13927/13927-31.png
http://reply.papertrans.cn/2/140/13927/13927-32.png
http://reply.papertrans.cn/2/140/13927/13927-33.png
Submitted on: 12 September 2008.
Revised on: 11 November 2008.
Accepted on: 19 December 2008.
___________________INTERNATIONAL JOURNAL OF PEDIATRIC OTORHINOLARYNGOLOGY
http://reply.papertrans.cn/2/140/13927/13927-35.png
http://reply.papertrans.cn/2/140/13927/13927-36.png