APCs	Autologous platelet concentrates
PPD	Probing pocket depth
HCAL	Horizontal clinical attachment loss
VCAL	Vertical clinical attachment loss
HFD	Horizontal furcation depth
VFD	Vertical furcation depth
GTR	Guided tissue regeneration
rhBMP2	Recombinant human bone morphogenetic protein-2
rhPDGF	Recombinant human platelet-derived growth factor
TGF-β	Transforming growth factor beta
PRP	Platelet-rich plasma
PRF	Platelet-rich fibrin
PRGF	Plasma rich in growth factors
CGF	Concentrated growth factors
PRISMA	Preferred reporting items for systematic reviews and meta-analysis
RCT	Randomized clinical trials
CI	Confidence interval
OFD	Open flap debridement
BG	Bone graft