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Authors
Li, Qiuping
Han, Tao
Zhang, Yanping
Zhang, Qian
Kong, Xiangyong
Yang, Yonghui
Feng, Zhichun https://orcid.org/0000-0002-6087-6982
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (81671504)
Department of National Health and Family Planning Commission (NO.momo2009-8)
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Article History
Received: 6 September 2018
Accepted: 10 October 2019
First Online: 13 November 2019
Ethics approval and consent to participate
: The Medical Ethics Committee of the Seventh Medical Center of PLA General Hospital (Beijing, China) approved this study.
: Not applicable.
: The authors declare that they have no competing interests.
