title: Commentary.
authors.affiliation: Fürst Medical Laboratory, Oslo, Norway. armin.piehler@medisin.uio.no
authors.forename: Armin P
authors.initials: AP
authors.lastname: Piehler
mesh_terms: D005260:Female; D006801:Humans; D009101:Multiple Myeloma / Q000175:diagnosis*; D016066:Pleural Effusion, Malignant / Q000175:diagnosis*