Dimitrios Karapiperis1, Spyridon Vrakas2, Simone Ignatova1, George Tribonias3, Thomas Franzen1
1Department of Gastroenterology, Vrinnevi General Hospital of Norrkoping, Norrkoping, Sweden
2Department of Gastroenterology, Tzaneio General Hospital, Athens, Greece
3Department of Gastroenterology, General Hospital of Nikaia-Piraeus ”Agios Panteleimon”, Athens, Greece