Secondary outcome measures (compare above) are complications caused by the stent or stent insertion and technical ease to insert the stent. To discover a 12% difference between the 2 groups, regarding patency, 400 patients must be included in the trial, alfa 0.05, beta 0.8. Investigators know from previous trials (Single center trial South Hospital GIE 2006;63:986-995 and a newly finished similar swedish multicenter trial,prel data DDW- 09)that the 9 hospitals recruited will be able to include this no of patients in approximately 2.5 years.