[1] Univ Barcelona, Inst Malalties Digest, Hosp Clin, IDIBAPS,Dept Med,Liver Unit, Barcelona 08036, Spain
[2] Univ Barcelona, Inst Malalties Digest, Hosp Clin, IDIBAPS,Dept Med,Endoscopy Unit, Barcelona 08036, Spain
[3] Univ Alcala de Henares, Hosp Ramon y Cajal, Dept Gastroenterol, Madrid, Spain
[4] Hosp Reina Sofia, Dept Gastroenterol, Cordoba, Spain
[5] Hosp Badalona Germans Trias & Pujol, Dept Gastroenterol, Badalona, Spain
[6] Univ Complutense Madrid, Hosp Gen Gregorio Maranon, Dept Gastroenterol, Madrid, Spain
[7] Univ Alcala de Henares, Clin Puerta de Hierro, Dept Gastroenterol, Madrid, Spain