The Scandinavian Propaten((R)) trial – 1-year patency of PTFE vascular prostheses with heparin-bonded luminal surfaces compared to ordinary pure PTFE vascular prostheses – a randomised clinical controlled multi-centre trial - Lindholt, JS; Gottschalksen, B; Johannesen, N (Eur J Vasc Endovasc Surg, 2011)