title: Letter by Opolski et al regarding article, "Patient characteristics and cell source determine the number of isolated human cardiac progenitor cells".
authors.forename: Maksymilian P
authors.initials: MP
authors.lastname: Opolski
authors.forename: Maciej
authors.initials: M
authors.lastname: Niewada
authors.forename: Adam
authors.initials: A
authors.lastname: Witkowski
mesh_terms: D002452:Cell Count / Q000379:methods; D002469:Cell Separation / Q000379:methods; D006325:Heart Atria / Q000473:pathology; D006801:Humans; D009206:Myocardium / Q000473:pathology; D032383:Myocytes, Cardiac / Q000473:pathology*; D011159:Population Surveillance; D013234:Stem Cells / Q000473:pathology*