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Authors
He, Junyong
He, Lixia https://orcid.org/0000-0003-1032-4482
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Funding
Funding for this research was provided by:
Health and Family Planning Commission of Sichuan province (16PJ302)
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Article History
Received: 27 February 2017
Accepted: 12 July 2018
First Online: 27 July 2018
Ethics approval and consent to participate
: Ethics approval was obtained from the Ethics Committee of Sichuan University. All participants provide written informed consent to take part in our study.
: Not applicable.
: The authors declare that they have no competing interests.
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