http://reply.papertrans.cn/3/271/27070/27070-31.png
http://reply.papertrans.cn/3/271/27070/27070-32.png
http://reply.papertrans.cn/3/271/27070/27070-33.png
http://reply.papertrans.cn/3/271/27070/27070-34.png
Submitted on: 05 January 2008.
Revised on: 11 February 2008.
Accepted on: 18 February 2008.
Revista Paulista de Pediatria
http://reply.papertrans.cn/3/271/27070/27070-36.png