1. SANA Hospital Lichtenberg, Medical Department I/Gastroenterology , Berlin 10365 , Germany
2. Interdisciplinary Center of Ultrasound Diagnostics, University Hospital Giessen and Marburg, Philipps University Marburg , Marburg 35033 , Germany
3. Department of Ultrasound, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine , Shanghai 200092 , China
4. Department of Medical Ultrasound, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology , Wuhan 430030 , Hubei Province , China
5. Imperial College London and Healthcare NHS Trust , London NW1 5QH , UK
6. Interventional, Diagnostic and Therapeutic Ultrasound Unit, Department of Medical and Surgical Sciences, IRCCS, Azienda Ospedaliero-Universitaria Sant' Orsola Malpighi Hospital , Bologna 40138 , Italy
7. University Clinic for Visceral Surgery and Medicine, INSELSPITAL, University Hospital of Bern , Bern 3010 , Switzerland
8. Division of Internal Medicine, Hepatobiliary and Immunoallergic Diseases, IRCCS Azienda Ospedaliero-Universitaria di Bologna , Bologna 40138 , Italy
9. Department of Internal Medicine (DAIM), Hirslanden Private Hospital Beau Site, Salem and Permanence , Bern CH-3013 , Switzerland