M. Kumar, B. Vandermeer, D. Bassler, and N. Mansoor, “Low-dose heparin for prolonging the patency of peripheral intravenous catheters in adults a systematic review and meta-analysis”, IJM, vol. 2, no. 1, pp. 13–21, Apr. 2014, doi: 10.14419/ijm.v2i1.2179.