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Authors
Zhang, Yanhong
Lin, Yuanyuan
Zhang, Jianwu
Li, Li
Liu, Xinxin
Wang, Tianhe
Gao, Zhenzhong https://orcid.org/0000-0001-5251-3615
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Funding
Funding for this research was provided by:
the National Key Technology Research and Development Program of the Ministry of Science and technology of China (2015BAI06B05)
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Article History
Received: 6 February 2018
Revised: 6 June 2018
Accepted: 18 June 2018
First Online: 30 June 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of Weifang Maternity and Child Health Hospital and with the 1964 Declaration of Helsinki and its later amendments or with comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.
