Funding for this research was provided by:
Wenzhou health and family planning commission ((Y20170763))
Text and Data Mining valid from 2020-03-30
Received: 15 September 2019
Accepted: 11 March 2020
First Online: 30 March 2020
Ethics approval and consent to participate
: The study design was approved by the Ethical Committee of Wenzhou Central Hospital. All participants provided written informed consent.
: Not Applicable.
: The authors declare that they have no competing interests.