- Correspondence to Dr Ying Yang, National Research Institute for Family Planning, National Human Genetic Resources Center, Beijing 100081, China; and Dr Xu Ma, National Research Institute for Family Planning, National Human Genetic Resources Center, Graduate School of Peking Union Medical College, Beijing 100081, China;
- Received November 28, 2017
- Revised May 14, 2018
- Accepted May 14, 2018
- First published June 11, 2018.
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