Funding for this research was provided by:
NationalNatural Science Foundation of China (81701410)
Beijing-Tianjin-HeBei project (19JCZDJC65000)
Received: 9 August 2020
Accepted: 30 October 2020
First Online: 12 November 2020
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of Tianjin Medical University General Hospital and written informed consent was obtained from the couple.
: Written consent for publication was obtained from the couple in this study.
: All authors declare no competing interests.