University of Medicine and Pharmacy, Timisoara, Timis, Romania
Researche Center of Gastroenterology and Hepatology, Craiova, Dolj, Romania
Department of Internal Medicine II, Hospital Meiningen, Meiningen, Germany
Insitute of Medicine, University of Bergen and National Centre for Ultrasound in Gastroenterology, Haukeland University Hospital, Bergen, Norway
University Hospital, Santiago de Compostela, Santiago de Compostela, Spain
Caritas-Krankenhaus, Bad Mergentheim, Germany
University Clinic Mainz, Mainz, Germany
HELIOS Klinikum Wuppertal, University of Witten/Herdecke, Wuppertal, Germany