RAVARI H.; KAZEMZADE G. H.; MODAGHEGH M. H. S.; KHASHAYAR P. Patency rate and complications of polytetrafluoroethylene grafts compared with polyurethane grafts for hemodialysis access. Upsala Journal of Medical Sciences, v. 115, n. 4, p. 245–248, 11 Mar. 2010.