 The aim in the current proposal is to evaluate the long-term outcome of the EndoBarrier device. The group of participants the investigators want to study participated in earlier studies at the Maastricht University Medical Center MUMC and the Atrium Medical Center in Heerlen. Three years of follow-up after the EndoBarrier device is now available. The investigators hope to give new insights in the postoperative status and postoperative symptoms experienced by the study participants using standardised questionnaires and evaluating blood samples. The goal of the investigators is to study the long-term effect of the EndoBarrier procedure and to possibly provide insight in the relation between successfailure and objective parameters. 