http://reply.papertrans.cn/1/15/1495/1495-31.png
http://reply.papertrans.cn/1/15/1495/1495-32.png
http://reply.papertrans.cn/1/15/1495/1495-33.png
http://reply.papertrans.cn/1/15/1495/1495-34.png
Submitted on: 30 December 2012.
Revised on: 18 April 2013.
Accepted on: 05 June 2013.
___________________AMERICAN SURGEON---SAGE PUBLICATIONS INC
http://reply.papertrans.cn/1/15/1495/1495-36.png