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Authors
Li, Tian-gang
Zhang, Yao-yue
Nie, Fang
Peng, Mei-juan
Li, Yun-Zhi
Li, Pei-long
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Article History
Received: 13 February 2020
Accepted: 1 June 2020
First Online: 12 June 2020
Ethics approval and consent to participate
: The study protocol was approved by the Medical Ethics Committee of Gansu Provincial Maternity and Child-care Hospital (Approval number 2013–02).
: The pregnant mothers provided their written informed consent and related images was obtained from the mother of the fetues.
: The authors declare that they have no competing interests.
