Long-term patency rates, complications and cost-effectiveness of polytetrafluoroethylene (PTFE) grafts for hemodialysis access: a prospective study that compares Impra versus Gore-Tex grafts. - Hurlbert,S.N.; Mattos,M.A.; Henretta,J.P.; Ramsey,D.E. (Cardiovasc Surg, 1998)