[1] Hosp Clin San Carlos, Dept Gastroenterol, IBD Unit, Madrid, Spain
[2] Hosp Clin San Carlos, Pathol, Madrid, Spain
[3] Hosp Univ Puerta Hierro, Gastroenterol, Madrid, Spain
[4] Hosp Univ 12 Octubre, Gastroenterol, Madrid, Spain
[5] Hosp Univ Fuenlabrada, Gastroenterol, Madrid, Spain
[6] Hosp Univ Fdn Alcorcon, Gastroenterol, Madrid, Spain
[7] Hosp Univ La Fe, Gastroenterol, Valencia, Spain
[8] Hosp Univ Ramon Y Cajal, Madrid, Spain
[9] Hosp Clin Univ Valencia, Gastroenterol, Valencia, Spain