Institute of Medicine;
University of Bergen;
NO-5021 Bergen;
Norway;
National Centre for Ultrasound in Gastroenterology;
Department of Medicine;
Haukeland University Hospital;
NO-5021 Bergen;
Norway;
Deparment of Medicine;
Aalesund Hospital;
Aalesund;
Norway;
Mech-Sense;
Aalborg Hospital;
9000 Aalborg;
Denmark;