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. 2021 May 20;12:671867. doi: 10.3389/fneur.2021.671867

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Copyright © 2021 Cui, Zorrilla-Veloz, Hu, Guan and Ma.

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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Funnel plots of publication bias for different PET tests. (A) ¹⁸F-FET PET (TBRmax), (B) ¹⁸F-FDG PET, (C) ¹¹C-MET PET (TBR), (D) ¹⁸F-DOPA PET, (E) FET-PET/MRI, and (F) multi-parameters FET-PET.