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Authors
Yu, Jun https://orcid.org/0000-0001-5009-2941
Ren, Chao-yi
Wang, Jun
Cui, Wei
Zhang, Jin-juan
Wang, Yi-jun
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Funding
Funding for this research was provided by:
key research project of Tianjin health and family planning commission (15KG114)
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Article History
Received: 6 January 2021
Accepted: 12 August 2021
First Online: 30 August 2021
Declarations
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: This study was approved by the local ethics committee of Tianjin Third Central Hospital. All patients provided written informed consent and were treated in accordance with the Declaration of Helsinki.
: We declare that all patients have signed an informed consent form which state that the details/images/videos will be freely available on the internet and may be seen by the general public.
: The authors declare that they have no competing interests.
