- Correspondence to Mr Binbin Wang, Center for Genetics, National Research Institute for Family Planning, Beijing, China; ; Ms Xi Jin, , National Center for Women and Children's Health, Chinese Center for Disease Control and Prevention, Beijing, China; ; Mr Xu Ma, Center for Genetics, National Research Institute for Family Planning, Beijing, China;
- Received April 6, 2018
- Revised July 21, 2018
- Accepted July 23, 2018
- First published August 17, 2018.
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