Do the fibrin architecture and leukocyte content influence the growth factor release of platelet concentrates? - Dohan, Ehrenfest DM; Bielecki, T; Jimbo, R (An evidence-based answer comparing a pure platelet-rich plasma (P-PRP) gel and a leukocyte- and platelet-rich fibrin (L-PRF) Curr Pharm Biotechnol, 2012)