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Authors
Luan, Tongxiao
Zhuang, Yingzhu
Nie, Weihong
Yang, Sumin
Wu, Yuhui
Wang, Rongmei
Dai, Yunyan
Zhang, Hong
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Article History
Received: 30 January 2021
Accepted: 14 April 2021
First Online: 22 April 2021
Declarations
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: The study protocol was conducted by the Declaration of Helsinki and was approved by Ethics Committee of Affiliated Hospital of Qingdao University (QYFYWZLL 26117-02). All the participates were able to provide written informed consent or have an authorized principal (immediate relatives) willing to provide consent on their behalf.
: Not applicable.
: Not applicable.
