Table 1.

Terms and keywords selected for each evaluated variable. A search in Medline (PubMed), Scopus and Web of Science was performed using equations for all three variables.

Variable	Keywords	Equation
Skeletal stem cells	“Skeletal stem cells” “Mesenchymal stem cells” ” Stromal stem cells” “Mesenchymal Stromal stem cells”	“Skeletal stem cells” OR “Mesenchymal stem cells“ OR “stromal stem cells” OR “Mesenchymal Stromal stem cells”
AND
Cell Surface marker	“Surface markers” Biomarkers “clusters of differentiation” Identification	“Surface markers” OR Biomarkers OR “clusters of differentiation” OR Identification
AND
in situ and in vitro	“in vivo” “in vitro” “Cell culture” “in situ”	“in vivo” OR “in vitro” OR “Cell culture” OR culture OR “in situ”
NOT
		Equine OR Bovine OR Rhesus OR Rat OR Mice OR Rodent OR Rabbit OR Porcine OR Canine OR Ovine OR Cryconservation OR Adipose OR “Umbilical Cord” OR Placenta OR “Dental pulp” OR Neuron OR Hepatitis OR Arterio* OR Skin OR Murine OR Mucosa OR Pancreatic* OR animal.