[1] Dist Hosp Bialystok, Dept Gastroenterol & Internal Med, Bialystok, Poland
[2] Med Univ Wroclaw, Dept Pediat Gastroenterol & Nutr, PL-50369 Wroclaw, Poland
[3] Med Univ Wroclaw, Dept Gastroenterol & Hepatol, PL-50369 Wroclaw, Poland
[4] Nicolaus Copernicus Univ Torun, L Rydygiera Collegium Medicum Bydgoszcz, Dept Pediat Allergol & Gastroenterol, Bydgoszcz, Poland
[5] Res Inst, Dept Gastroenterol, Lodz, Poland
[6] Res Inst, Pediat Polish Mothers Mem Hosp, Lodz, Poland
[7] Med Univ Katowice, Dept Gastroenterol & Hepatol, Katowice, Poland
[8] Med Univ Lublin, Dept Gastroenterol, Lublin, Poland
[9] Med Univ Poznan, Dept Gastroenterol & Metab Dis, Poznan, Poland
[10] State Hosp Rzeszow, Dept Pediat, Rzeszow, Poland
[11] Med Univ Bialystok, Dept Gastroenterol & Internal Med, Bialystok, Poland
[12] Inst Food & Nutr, Dept Gastroenterol, Warsaw, Poland
[13] Childrens Mem Hlth Inst Warsaw, Dept Microbiol, Warsaw, Poland
[14] Med Univ Bialystok, Dept Biochem Diag, Bialystok, Poland
[15] Med Univ Wroclaw, Dept Microbiol, Wroclaw, Poland
[16] Med Univ Szczecin, Dept Gastroenterol & Hepatol, Szczecin, Poland
[17] Collegium Medicum Krakow, Dept Epidemiol, Krakow, Poland
[18] Med Univ Bialystok, Dept Pediat Gastroenterol & Allergol, Bialystok, Poland
[19] Med Univ Bialystok, Dept Med Pathomorphol, Bialystok, Poland