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"This is the peer reviewed version of the following article: Koidou, VP, Cavalli, N, Hagi‐Pavli, E, Nibali, L, Donos, N. Expression of inflammatory biomarkers and growth factors in gingival crevicular fluid at different healing intervals following non‐surgical periodontal treatment: A systematic review. J Periodont Res. 2020; 55: 801– 809. https://doi.org/10.1111/jre.12795 which has been published in final form at https://doi.org/10.1111/jre.12795 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions."