Funding for this research was provided by:
National Natural Science Foundation of China (No. 31501207)
The National Key Research and Development Program of Reproductive Health & Major Birth Defects Control and Prevention (No.2016YFC1000407)
Key Program of International Cooperation of NSFC (No. 81520108013)
Text and Data Mining valid from 2019-08-30
Received: 18 July 2019
Accepted: 21 August 2019
First Online: 30 August 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the First Affiliated Hospital of Chongqing Medical University. Informed consent was not required because the study used deidentified data and was retrospective.
: The authors declare that they have no competing interests and the patients in this case report had provided their consent for publication.
: The authors declare no conflicts of interest.