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. 2023 Mar 13;10:977433. doi: 10.3389/fmed.2023.977433

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Copyright © 2023 Meng, Hou, Zhang, Gu, Shi, Li, Wang, Zhang, Ren, Chen, Yuan, Guo, Li, Ma, Dong, Liu, Shang, Li, Xu, Lv and Zhang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Map of the patient residences and hospital locations. The red star, orange location symbols, and blue dots represent Beijing, hospital locations, and patient residences, respectively.