title: Reply: What Might Be versus What Is.
authors.affiliation: 1 University of Pittsburgh Pittsburgh, Pennsylvania.
authors.forename: Donald M
authors.initials: DM
authors.lastname: Yealy
mesh_terms: D015415:Biomarkers; D006801:Humans; D020097:Natriuretic Peptide, Brain; D010446:Peptide Fragments
chemical_list: D015415:Biomarkers; D010446:Peptide Fragments; D020097:Natriuretic Peptide, Brain