Liu, Zhi-guo
Di, Dong-dong
Wang, Miao
Liu, Ri-hong
Zhao, Hong-yan
Piao, Dong-ri
Zhao, Zhong-zhi
Hao, Yong-qing
Du, Ya-nan
Jiang, Hai
Cui, Bu-yun
Xia, Xian-zhu
Funding for this research was provided by:
Medical and Hygiene Research Projects of the Inner Mongolia Health and Family Planning Commission (201301094)
National Natural Science Foundation of China (81271900)
Article History
Received: 11 January 2017
Accepted: 4 January 2018
First Online: 16 January 2018
Consent for publication
: Not applicable.
: The authors declare that they have no competing interests.
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