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Authors
Qin, Wenzhe
Xu, Lingzhong
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Article History
Received: 17 October 2022
Accepted: 23 January 2023
First Online: 31 January 2023
Declarations
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: Each participant provided informed consent. The study protocol was approved by the Ethical Committee of the Centre for Health Management and Policy Research, Shandong University (approval number: LL20191220). All methods were carried out in accordance with the relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.
