1. Department of General and Gastrointestinal Surgery, Orlowski Hospital, Centre of Postgraduate Medical Education, Warsaw, Poland
2. Department of Gastroenterology, Hepatology and Clinical Oncology, Centre of Postgraduate Medical Education, Warsaw, Poland; Department of Oncological Gastroenterology Institute of Oncology, Warsaw, Poland
3. Department of Oncology and Nursing Oncology, Institute of Nursing and Obstetrics, Faculty of Medicine and Health Sciences, Jan Kochanowski University, Kielce, Poland; Department of General Surgery, Medicover Hospital, Warsaw, Poland