1. Department of Endoscopy, Specialist Hospital of Alfred Sokolowski, Wałbrzych, Poland
2. Department of Gastroenterology and Internal Medicine, SPWSZ Hospital, Szczecin, Poland
3. Department of Plastic, Endocrine and General Surgery, Pomeranian Medical University, Szczecin, Poland
4. Department of Gastroenterology, Hospital of the Ministry of Internal Affairs in Szczecin, Poland