1. Department of Cancer Prevention Maria Sklodowska‐Curie National Research Institute of Oncology Warsaw Poland
2. Department of Gastroenterology, Hepatology and Clinical Oncology Centre of Postgraduate Medical Education Warsaw Poland
3. Polish National Cancer Registry Maria Sklodowska‐Curie National Research Institute of Oncology Warsaw Poland
4. Department of Oncological Gastroenterology Maria Sklodowska‐Curie National Research Institute of Oncology Warsaw Poland
5. Department of Health Management and Health Economics University of Oslo Oslo Norway