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Authors
Wei, Weiyi
Tao, Hong
Chen, Wenxia
Wu, Xiaoqin
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Funding
Funding for this research was provided by:
Science and Technology Department of Gansu Province (20JR5RA518, 20JR5RA518)
Northwest Normal University (LKZD2021-06, LKZD2021-06)
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Article History
Received: 28 January 2022
Accepted: 5 May 2022
First Online: 18 May 2022
Declarations
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: The study was approved by Gansu Provincial Center For Disease Control And Prevention in China and received ethical approval from Ethics Committee of Gansu Provincial Center For Disease Control And Prevention. The study was performed in compliance with the World Medical Association Declaration of Helsinki on Ethical Principles for Medical Research Involving Human Subjects, and research regulations of the country. Informed consent from the patients was exempt by Ethics Committee of Gansu Provincial Center For Disease Control And Prevention in China due to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.
