[1] Univ Autonoma Barcelona, Corp Sanitaria Parc Tauli, Dept Gastroenterol, Sabadell, Spain
[2] Hosp Univ Infanta Sofia, Gastroenterol Unit, Madrid 28702, Spain
[3] Univ Autonoma Madrid, Hosp Univ La Princesa, Inst Invest Princesa IP, CIBERehd,Dept Gastroenterol, E-28049 Madrid, Spain
[4] Hosp Univ Infanta Leonor, Gastroenterol Unit, Madrid, Spain
[5] Hosp Carlos Haya, Dept Gastroenterol, Malaga, Spain
[6] Hosp Donostia, Dept Gastroenterol, San Sebastian, Spain
[7] Hosp Castellon, Dept Gastroenterol, Castellon de La Plana, Spain
[8] Inst Carlos III, CIBEREHD, Madrid, Spain