title: Biographical feature: John Matsen, M.D.
authors.affiliation: Division of Medical Microbiology, Department of Pathology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
authors.forename: Karen C
authors.initials: KC
authors.lastname: Carroll
mesh_terms: D019411:Clinical Laboratory Techniques / Q000379:methods*; D003141:Communicable Diseases / Q000175:diagnosis*; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D013677:Medical Laboratory Science / Q000379:methods* / Q000639:trends