1. Department of Gastroenterology and Gastrointestinal Oncology, University Medical Centre, Goettingen, Germany;
2. Ovesco Endoscopy AG, Tuebingen, Germany;
3. Novineon CRO & Consulting Ltd, Tuebingen, Germany;
4. Pathology Institute Nuertingen, Germany;
5. Interventional and Experimental Endoscopy (InExEn), Medizinische Klinik I, University Medical Centre Ulm, Germany;
6. Department of Gastroenterology, Vivantes Klinikum in Friedrichshain, Teaching Hospital of Charité Humboldt University, Berlin, Germany