The white blood cell, platelet, lymphocyte, neutrophil, monocyte, and red blood cell counts of the PRP and plasma were measured using a blood analyzer (Advia 2120, Bayer); as described in our previous study22 (link), several growth factors were detected using an enzyme-linked immunosorbent assay (ELISA). The standard curve was obtained for each experiment. Platelet-derived growth factor (PDGF) AA, PDGF BB (RayBiotech Co., Georgia, USA), epidermal growth factor (EGF), and vascular epidermal growth factor (VEGF; Koma Co., Republic of Korea) levels were quantitatively measured using ELISA kits, with reference range was from 0 to 3000 (PDGF AA), from 0 to 2000 (PDGF BB), from 0 to 1000 (EGF) and from 0 to 1000 (VEGF) pg/ml, respectively. All measurements were conducted in triplicate.