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. 2022 Feb 10;9:770699. doi: 10.3389/fmed.2022.770699

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Copyright © 2022 Wang, Li, Chen, Xu, Yang, Rong and Zhu.

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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Flowchart of patient enrollment. After deleting invalid cases through the exclusion criteria, 176 patients were enrolled and divided into the BK virus (BKV) activation group (n = 42) and the control group (n = 134) according to BKV-DNA levels in plasma and urine.