1. Department of Gastroenterology with Endoscopy Unit, Medical University of Lublin, 8 Jaczewski Street, 20-954 Lublin, Poland
2. Department of Clinical Immunology, Medical University of Lublin, 4A Chodzki Street, 20-093 Lublin, Poland
3. Department of Mathematics and Biostatistics, Medical University of Lublin, 4 Jaczewski Street, 20-090 Lublin, Poland