[1] Hosp Gen Univ Alicante, Unidad Gastroenterol, Alicante 03010, Spain
[2] Hosp Gen Univ Alicante, Dept Clin Pharmacol, Alicante 03010, Spain
[3] Univ Basque Country, CIBERehd, Hosp Donostia, Dept Gastroenterol, San Sebastian, Spain
[4] Univ Zaragoza, Dept Gastroenterol, Hosp Clin Lozano Blesa, CIBERehd, Zaragoza, Spain
[5] Complexo Hosp Vigo, Dept Gastroenterol, Vigo, Spain
[6] Complexo Hosp Ourense, Dept Gastroenterol, Orense, Spain
[7] Hosp Univ Virgen de la Arrixaca, Unidad Gest Clin Digest, Inst Murciano Invest Biosanitaria, Murcia, Spain
[8] Hosp Univ Canarias, Dept Gastroenterol, Santa Cruz De Tenerife, Spain
[9] Complejo Hosp Castellon, Dept Gastroenterol, Castellon De La Plana, Spain
[10] Univ Barcelona, Dept Gastroenterol, Hosp Clin, CIBERehd,IDIBAPS, Barcelona, Spain
[11] Hosp del Mar, Dept Gastroenterol, Barcelona, Spain
[12] Hosp Puerta de Hierro, Dept Gastroenterol, Madrid, Spain
[13] Hosp Univ La Fe, Dept Gastroenterol, Valencia, Spain
[14] Hosp 12 Octubre, Dept Gastroenterol, E-28041 Madrid, Spain
[15] Hosp de la Princesa, Dept Gastroenterol, CIBERehd, Madrid, Spain
[16] Fdn Hosp Alcorcon, Dept Gastroenterol, Madrid, Spain
[17] Hosp Clin San Carlos, Dept Gastroenterol, Madrid, Spain
[18] Policlin Guipuzkoa, Dept Gastroenterol, San Sebastian, Spain
[19] Conselleria Sanitat, Direcc Gen Salud Publ, Canc Screening Program, Valencia, Spain