Affiliation: | 1. Department of General, Endocrine and Transplant Surgery, Medical University of Gdansk, Gdansk, Poland;4. Department of Gastroenterology, Hepatology and Clinical Oncology, Centre of Postgraduate Medical Education, Warsaw, Poland;6. Department of Oncological Gastroenterology, the Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland;5. Clinical Effectiveness Research Group, Institute of Health and Society, University of Oslo, Oslo, Norway;3. Department of Cancer Prevention, the Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland |