[1] HUMBOLDT UNIV BERLIN, KLINIKUM RUDOLF VIRCHOW, DEPT GASTROENTEROL, BERLIN, GERMANY
[2] HUMBOLDT UNIV BERLIN, KLINIKUM RUDOLF VIRCHOW, DEPT CENT INTERDISCIPLINARY ENDOSCOPY, BERLIN, GERMANY
[3] HUMBOLDT UNIV BERLIN, KLINIKUM RUDOLF VIRCHOW, DEPT RADIOL, BERLIN, GERMANY