Center of digestive diseases, Hamburg, Germany
University Hospital of Linköping, Linköping, Sweden
Magen-Darm-Zentrum, IKE - Internistische Kooperation Eppendorf, Hamburg, Germany
Site 122, Panaji, India
Site 102, Pondichéry, India
Site 103, Vijayawada, India
Med. Klinik I - Markus-Krankenhaus - Frankfurter Diakonie-Kliniken, Frankfurt, Germany
United Medical Research, New Smyrna Beach, Florida, United States
Robert-Bosch Krankenhaus, Innere Medizin I, Stuttgart, Germany
Universitaetsklinik für Innere Medizin III, Abteilung Gastroenterologie and Hepatologie, Vienna, Austria
University of Regensburg, Regensburg, Germany
The Hebrew University-Hadassah School of Dental Medicine, Department of Oral Medicine, Jerusalem, Israel
Medical School Hannover, Hannover, Niedersachsen, Germany
Klinik für Radioonkologie und Strahlentherapie - Klinikum Braunschweig, Braunschweig, Germany
Strahlentherapie, St. Vincentius-Kliniken gAG, Karlsruhe, Germany
Strahlentherapie, Klinikum Mutterhaus der Borromäerinnen, Trier, Germany
Universitätsklinikum Bonn, Bonn, NRW, Germany
Hôpital Saint-Antoine, Paris, France