Fig. 1From: Leukocyte- and platelet-rich fibrin in endoscopic endonasal skull base reconstruction: study protocol for a multicenter prospective, parallel-group, single-blinded randomized controlled non-inferiority trialLeukocyte- and platelet-rich fibrin (L-PRF) preparation protocol. Membrane preparation after blood collection in glass tubes and centrifugation for 12 min (400 g), compression of the fibrin clotBack to article page