title: 87-year-old man with macrocytic anemia.
authors.affiliation: Mayo Graduate School of Medicine, Mayo Clinic, Rochester, Minn., USA.
authors.forename: W J
authors.initials: WJ
authors.lastname: Hogan
authors.forename: N E
authors.initials: NE
authors.lastname: Kay
mesh_terms: D000368:Aged; D000748:Anemia, Macrocytic / Q000209:etiology* / Q000503:physiopathology; D005434:Flow Cytometry; D006801:Humans; D016130:Immunophenotyping; D008218:Lymphocytosis; D008232:Lymphoproliferative Disorders / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology; D008297:Male