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Authors
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Funding
Funding for this research was provided by:
Qingdao Science and Technology Plan (17-3-3-23-nsh)
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Article History
Received: 19 July 2020
Accepted: 7 November 2020
First Online: 23 November 2020
Compliance with ethical standards
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: We declare no conflict of interest.
: This study was approved by the Ethics Committee of Qingdao Women and Children's Hospital. All procedures performed in this study involving human participants were in accordance with the 1964 Helsinki Declaration and its later amendments.
: Informed consent was obtained from all individual participants included in the study.
