title: Prophylaxis for deep-vein thrombosis.
mesh_terms: D004087:Dihydroergotamine / Q000627:therapeutic use*; D006493:Heparin / Q000627:therapeutic use*; D006801:Humans; D012107:Research Design; D013924:Thrombophlebitis / Q000517:prevention & control*
chemical_list: D004087:Dihydroergotamine; D006493:Heparin