QING Fang-yuan
Corresponding author.
Email: E-mail: qinfangyuan@hnbeike.com
CHEN Ya-ning
HAN Shuang-yin
Email: E-mail:shuangyinhan@yahoo.com
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Manuscript received: June 15,2012
Manuscript revised: September 25,2012
Adopted:
Online Published: January 07,2013
Published: