title: Careful attention to blood sampling as a preanalytical determinant of circulating matrix metalloproteinase 9 to avoid misinterpretations: comment on the article by Ainiala et al.
authors.forename: Klaus
authors.initials: K
authors.lastname: Jung
mesh_terms: D015415:Biomarkers / Q000097:blood*; D001800:Blood Specimen Collection / Q000379:methods*; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000201:enzymology*; D020780:Matrix Metalloproteinase 9 / Q000097:blood*
chemical_list: D015415:Biomarkers; D020780:Matrix Metalloproteinase 9