title: Letter: Single-dose ampuls, undertreatment and low-dose heparin prophylaxis.
mesh_terms: D004349:Drug Packaging; D006493:Heparin / Q000008:administration & dosage* / Q000627:therapeutic use; D006801:Humans; D013924:Thrombophlebitis / Q000517:prevention & control
chemical_list: D006493:Heparin