1. Department of Clinical SciencesIntervention and Technology (CLINTEC)Karolinska InstitutetStockholmSweden
2. Department of SurgerySkaraborg HospitalSkövdeSweden
3. Center for Digestive DiseasesKarolinska University HospitalStockholmSweden
4. Department of SurgerySkåne University Hospital at LundLund UniversityLundSweden