Liao, Guixiang http://orcid.org/0000-0002-4369-8811
Zhao, Zhihong
Khan, Muhammad
Yuan, Yawei
Li, Xianming
Funding for this research was provided by:
Natural Science Foundation of Shenzhen (JCYJ20170307095828424)
Shenzhen Health and Famly Planning System Research Project (SZBC2017024)
the technical research and cultivation project for the youth of Shenzhen people’s hospital (SYKYPY2019029)
Article History
Received: 28 March 2019
Accepted: 14 May 2019
First Online: 23 May 2019
Ethics approval and consent to participate
: The study did not need ethics approval
: Not available.
: The authors declare that they have no competing interests.