Eitan Heldenberg1, Jonathan Lorber2, David Cheyn2, Arie Bass2. 1. Department of Vascular Surgery, Assaf Harofeh Medical Center, Zerifin, affiliated to the Sackler School of Medicine, Tel Aviv University, Israel. Electronic address: eitan@heldenberg.name. 2. Department of Vascular Surgery, Assaf Harofeh Medical Center, Zerifin, affiliated to the Sackler School of Medicine, Tel Aviv University, Israel.