Funding for this research was provided by:
National Natural Science Foundation of China (No.81771645)
Clinical Research Center For Reproduction and Genetics In Hunan Province
Text and Data Mining valid from 2020-05-06
Received: 7 February 2020
Accepted: 24 April 2020
First Online: 6 May 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Ethics Committee of the Reproductive and Genetic Hospital of Citic-Xiangya, and written informed consent was obtained from all the participants prior to the genetic study.
: Written informed consent forms were obtained from both the couples.
: The authors declare that they have no competing interests.