a	Autologous
ABI	Ankle brachial index
aBMCs	Autologous bone marrow cell transplantation
AD	Arteriolar density
ADRCs	Adipose-derived regenerative cells
AFS	Amputation free survival
AFSCs	Amniotic fluid-derived stem cells
AI	Angiographic index
AR	Amputation rate
ASCs	Adipose tissue derived stem cells
ASO	Atherosclerosis obliterans
BM-MNCs	Bone marrow-derived mononuclear cells
BM-MSCs	Bone marrow mesenchymal stem cells
BM-TNCs	Bone marrow total nucleated cells
BFP	Blood flow perfusion
CACs	Circulating angiogenic cells
CBF	Calf blood pressure
CD	Capillary density
CM	Conditioned medium
CLI	Critical limb ischemia
CVDs	Cardiovascular diseases
CVF	Collateral vessel formation
DM	Diabetes mellitus
DR	Death rate
ECFCs	Endothelial colony forming cells
ECs	Endothelial cells
ECEPCs	Enriched circulating endothelial progenitor cells
EPCs	Endothelial progenitor cells
ESC-ECP	Stem cell-derived endothelial cell product
FAL	Femoral artery ligation
FGF1	Fibroblast growth factor 1
FS	Functional score
G-CSF	Granulocyte colony-stimulating factor
HD	High dose
HGF	Hepatocyte growth factor
HIF-1a	Hypoxia-inducible factor 1-alpha
HPCs	Hematopoietic progenitor cells
h	Human
IA	Intraarterial
IC	Intracardiac
IHC	Immunohistochemistry
IM	Intramuscular
IV	Intravenous
LD	Low dose
LDP	Laser Doppler Perfusion
MACs	Myeloid angioenic cells
MD	Medium dose
MMPs	Matrix metalloproteinases
MP	Matrigel plug
MSCs	Mesenchymal stem cells
NC	Non-controlled
NO	Nitric oxide
NR	Non-randomized
PAD	Peripheral arterial disease
PB-MNCs	Peripheral blood mononuclear cells
PFWD	Pain-free walking distance
PRP	Platelet-rich plasma
RCT	Randomized controlled trial
RPS	Rest pain score
SC	Subcutaneous
SMCs	Smooth muscle cells
SMPCs	Smooth muscle progenitor cells
SVF	Stromal vascular fraction
TAO	Thrombo-angiitis obliterans
TcPO2	Transcutaneous oxygen pressure
TR	Tissue regeneration
UH	Ulcer healing
VAS	Visual analogue scale
VD	Vessel diameter
VEGF	Vascular endothelial growth factor
VIP	Vascular intersection percentage
VS	Visual Scale
VSEL	Very small embryonic-like stem cells