1. Heparin-lock or keep-open IV?;Hanson;Am J Nurs,1976
2. A comparison of the rate of complications with heparin-lock and keep-open IVs;Hanson;Commun Nurse Res,1977
3. Tips on drawing blood through a heparin-lock;Miller;RN,1986
4. An open prospective trial to compare the hematological and biochemical routine laboratory results from a peripheral arm vein and from a fully implanted venous drug delivery device [lett;Schmid;Ann Oncol,1990
5. Intravenous catheter aspiration for obtaining basic analytes during intravenous infusion;Herr;Ann Emerg Med,1990