[1] Cent Clin Hosp, Minist Internal Affairs, Dept Gastroenterol, IBD Subdivis, 137 Woloska St, PL-02507 Warsaw, Poland
[2] Med Postgrad Educ Ctr, Dept Gastroenterol Hepatol & Clin Oncol, Warsaw, Poland
[3] Maria Sklodowska Curie Clin Oncol Inst, Dept Gastrointestinal Oncol, Warsaw, Poland
[4] St Barbara Hosp, Dept Gastroenterol & Gastrointestinal Oncol, Sosnowiec, Poland
[5] Nicolaus Copernicus Univ Torun, Univ Hosp 2, Coll Med Bydgoszcz, Gastroenterol Nursing Unit, Torun, Poland
[6] Poznan Univ Med Sci, Dept Gastroenterol Human Nutr & Internal Dis, Poznan, Poland
[7] Med Univ Lodz, Dept Gastrointestinal Dis, Lodz, Poland
[8] Med Univ Lublin, Dept Gastroenterol & Endoscopy, Lublin, Poland
[9] Jan Kochanowski Univ Humanities & Sci, Fac Hlth Sci, Kielce, Poland