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Authors
Zhang, Shuang
Liu, Huikun
Li, Nan
Dong, Wei
Li, Weiqin
Wang, Leishen
Zhang, Yu
Yang, Yingzi
Leng, Junhong
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Article History
Received: 6 July 2021
Accepted: 11 April 2022
First Online: 19 April 2022
Declarations
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: The study protocol was approved by the Human Subjects Committee of the Tianjin Women’s and Children’s Health Center. All methods were carried out in accordance with relevant guidelines and regulations. Since this was a retrospective analysis of data routinely collected from participants, the consent for participation was not applicable. The need for informed consent was waived by the Human Subjects Committee of the Tianjin Women’s and Children’s Health Center.
: Not applicable.
: The authors declare that they have no competing interests.
