Funding for this research was provided by:
the science and technology department’s major program of Henan, China (161100311100)
the national health and family planning commission in China (201601010)
The education department’s Project of Henan, China (19A320052)
Received: 29 July 2019
Accepted: 11 November 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: This study was reviewed and approved by the Ethics Committee of The Third Affiliated Hospital of Zhengzhou University.
: Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.