Department of Gastroenterology and Internal Medicine, National Medical Institute of the Ministry of the Interior and Administration, Warsaw, Poland

Department of Gastroenterology, Dietetics, and Internal Diseases, Poznan University of Medical Sciences, Poznan, Poland

Department of Gastroenterology and Internal Medicine, Military Institute of Medicine – National Research Institute, Warsaw, Poland

Department of Gastroenterology, St. Barbara Main District Hospital, Sosnowiec, Poland

Collegium Medicum, WSB University, Dąbrowa Górnicza, Poland

Department of Gastroenterology, Pomeranian Medical University, Szczecin, Poland

Department of Gastroenterology, Hepatology, and Internal Medicine, Wroclaw Medical University, Wroclaw, Poland

Department of Gastroenterology and Hepatology, Medical University of Gdansk, Poland

Department of Gastroenterology, Faculty of Medicine, Academy of Silesia, Katowice, Poland

Endoterapia, H-T Centrum Medyczne, Tychy, Poland

Department of Gastroenterological Oncology, Maria Skłodowska-Curie National Research Institute of Oncology, Warsaw, Poland

Department of Gastroenterology, Hepatology, and Clinical Oncology, Centre of Postgraduate Medical Education, Warsaw, Poland

Department of Gastroenterology and Hepatology with Endoscopic Unit, Medical University of Lublin, Poland

Department of Digestive Tract Diseases, Norbert Barlicki University Hospital, Lodz, Poland

Department of Gastroenterology, Medical University of Lodz, Poland

Department of Gastroenterology, Masovian Brodnowski Hospital, Warsaw, Poland

Department of Gastroenterology with IBD Unit, St. Jadwiga Queen Hospital, Rzeszow, Poland

Department of Internal Medicine, Medical College, University of Rzeszow, Poland

Department of Gastroenterology and Hepatology, Medical University of Silesia, Katowice, Poland

Department of Gastroenterology, Self-Dependent Health Care Unit of the Ministry of the Interior, Gdansk, Poland

II Gastroenterology Department, Centre of Postgraduate Medical Education, Warsaw, Poland

Department of Gastroenterology and Hepatology, Jagiellonian University Medical College, Krakow, Poland

Department of Gastroenterology and Internal Medicine, Medical University of Bialystok, Poland

Department of Internal Diseases, General Hospital, Miedzychod, Poland

Department of Gastroenterology and Nutrition Disorders, Faculty of Health Sciences, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, Poland

Collegium Medicum, Jan Kochanowski University, Kielce, Poland