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Authors
Li, Yuanzhi
Li, Zhenfa
Song, Ligang
Xie, Weimin
Gong, Xianghao
He, Dongliang
Zhang, Xin
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Funding
Funding for this research was provided by:
hunan provincial commission of health and family planning (hunan provincial commission of health and family planning)
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Article History
Received: 27 April 2020
Accepted: 13 July 2020
First Online: 31 July 2020
Ethics approval and consent to participate
: The study is conducted in accordance with the Declaration of Helsinki. Potential participants receive detailed written and oral information on the study procedures and all participants provide written informed consent. Ethics approval of the study was obtained from the Hengyang Central Hospital and Southern Medical University.
: Not applicable.
: The authors declare that they have no competing interests.
