title: Comment on: Systemic lupus erythematosus patients exhibit functional deficiencies of endothelial progenitor cells.
authors.forename: Peter E
authors.initials: PE
authors.lastname: Westerweel
authors.forename: Ronald H W M
authors.initials: RH
authors.lastname: Derksen
authors.forename: Marianne C
authors.initials: MC
authors.lastname: Verhaar
mesh_terms: D002452:Cell Count; D042783:Endothelial Cells / Q000473:pathology*; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000473:pathology*; D012680:Sensitivity and Specificity; D013234:Stem Cells / Q000473:pathology*