Funding for this research was provided by:
Sanming Project of Medicine in Shenzhen (SZSM201406007)
Article History
Received: 4 March 2019
Accepted: 13 August 2019
First Online: 19 August 2019
Compliance with Ethical Standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: All the study participants gave a written informed consent. A formal consent was also issued by the Ethics Committee of the Baoan Maternal and Child Health Hospital, Jinan University (No. of Institutional Review Board: LLSC2018-02-01).
: Not applicable, the manuscript doesn’t contain any individual person’s data.
: Authors declare no conflict of interest.