title: Letter: Erythrocytosis and hypothyroidism.
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D006801:Humans; D007037:Hypothyroidism / Q000150:complications* / Q000188:drug therapy; D008297:Male; D011086:Polycythemia / Q000175:diagnosis / Q000209:etiology*; D013974:Thyroxine / Q000627:therapeutic use
chemical_list: D013974:Thyroxine