Huang, Xu Chen
Hu, Xu Hua
Wang, Xiao Ran
Zhou, Chao Xi
Wang, Fei Fei
Yang, Shan
Wang, Gui Ying
Funding for this research was provided by:
the Health and Family Planning Commission of Hebei Province (20150362)
the Key Research Project of Medical Science of Hebei Province (20160194)
Article History
Received: 3 October 2017
Accepted: 1 March 2018
First Online: 16 March 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.