[1] Corvinus Univ Budapest, Dept Hlth Econ, H-1093 Budapest, Hungary
[2] Semmelweis Univ, Doctoral Sch Clin Med, H-1085 Budapest, Hungary
[3] Charles Univ Prague, IBD Clin & Res Ctr, ISCARE As, Fac Med 1, Prague 170004, Czech Republic
[4] Maria Sklodowska Curie Mem Canc Ctr, Dept Gastroenterol, PL-01813 Warsaw, Poland
[5] Inst Oncol, PL-01813 Warsaw, Poland
[6] Med Ctr Postgrad Educ, PL-01813 Warsaw, Poland
[7] Univ Hosp Bratislava, Dept Internal Med 5, Gastroenterol Unit, SK-82606 Bratislava, Slovakia
[8] Med Univ Lodz, Dept Publ Hlth, Fac Hlth Sci, PL-02390 Warsaw, Poland
[9] Carol Davila Univ, Dept Gastroenterol & Hepatol, Bucharest 020022, Romania
[10] Lithuanian Univ Hlth Sci, Med Acad, Dept Gastroenterol, LT-50009 Kaunas, Lithuania
[11] Semmelweis Univ, Dept Med 1, H-1083 Budapest, Hungary