Canellas, 2022. Referee report. For: Pre-Clinical Study: Immunohistochemical evaluation of matrix metalloproteinase-13 on rabbit (Oryctolagus cuniculus) socket healing after application of platelet-rich fibrin with and without hydroxyapatite [version 2; peer review: 1 approved, 1 approved with reservations].. https://doi.org/10.5256/f1000research.137236.r147248