[1] Univ Cantabria, Hosp Univ Marques de Valdecilla, Inst Invest Sanitaria Valdecilla IDIVAL, Gastroenterol Dept, Santander 37008, Spain
[2] Univ Complutense, Hosp Univ Gregorio Maranon, Inst Invest Sanitaria Gregorio Maranon IiSGM, Gastroenterol Dept, Madrid 28009, Spain
[3] Univ Complutense, Dept Med, Madrid 28009, Spain
[4] Hosp Univ Clin Santiago, Gastroenterol Dept, Santiago De Compostela 15706, Spain
[5] Hosp Univ Ramon y Cajal, Gastroenterol Dept, Madrid 28034, Spain
[6] Hosp Univ Virgen del Rocio, Gastroenterol Dept, Seville 41013, Spain
[7] Hosp Univ Miguel Servet, Inst Invest Sanitaria Aragon IISA, Gastroenterol Dept, Zaragoza 50009, Spain
[8] Hosp Univ Marques de Valdecilla, Dept Gen & Digest Surg, Colorectal Unit, Santander 39008, Spain
[9] Hosp Univ Mutua Terrassa, Ctr Invest Biomed Red Enfermedades Hepat & Digest, Gastroenterol Dept, Terrassa 08221, Spain
[10] Hosp Univ Puerta de Hierro, Gastroenterol Dept, Majadahonda 28220, Spain
[11] Hosp Univ Basurto, Gastroenterol Dept, Bilbao 48013, Spain
[12] Hosp Univ Cent Asturias, Inst Invest Sanitaria Principado Asturias ISPA 33, Dept Gastroenterol, Oviedo 33011, Spain
[13] Hosp Univ Rio Hortega, Gastroenterol Dept, Valladolid 47012, Spain
[14] Hosp Gen Univ Elche, Gastroenterol Dept, Alicante 03203, Spain
[15] Univ Autonoma Madrid UAM, Gastroenterol Dept, Hosp Univ La Princesa, Inst Invest Sanitaria Princesa IIS IP,Ctr Invest, Madrid 28006, Spain
[16] Hosp Gen Alicante, Gastroenterol Dept, Ctr Invest Biomed Red Enfermedades Hepat & Digest, Inst Invest Sanitaria & Biomed Alicante ISABIAL, Alicante 03010, Spain
[17] Hosp Univ La Paz, Gastroenterol Dept, Madrid 28046, Spain
[18] Hosp Gen Univ Valencia, Gastroenterol Dept, Valencia 46014, Spain
[19] Hosp Clin Barcelona, Gastroenterol Dept, Barcelona 08036, Spain
[20] Hosp del Mar, Gastroenterol Dept, Barcelona 08003, Spain
[21] Hosp Rafael Mendez, Gastroenterol Dept, Lorca 30817, Spain
[22] Hosp St Joan Despi Moises Broggi, Gastroenterol Dept, Barcelona 08970, Spain
[23] Hosp Univ Parc Tauli, Gastroenterol Dept, Sabadell, Ctr Invest Biomed Red Enfermedades Hepat & Digest, Barcelona 08208, Spain
[24] Hosp Univ Caceres, Gastroenterol Dept, Caceres 10003, Spain
[25] Hosp Univ Cabuenes, Gastroenterol Dept, Gijon 33203, Spain
[26] Consorcio Sanitario Terrasa, Gastroenterol Dept, Barcelona 08227, Spain
[27] Hosp Santa Barbara, Gastroenterol Dept, Puertollano 13500, Spain
[28] Hosp Univ Vitoria Gasteiz, Gastroenterol Dept, Vitoria 01002, Spain
[29] Hosp Clin Univ Valencia, Gastroenterol Dept, Valencia 46010, Spain
[30] Hosp Arquitecto Marcide, Gastroenterol Dept, Ferrol 15405, Spain
[31] Hosp Univ Gregorio Maranon, Dept Colorectal & Gastrointestinal Surg, Madrid 28009, Spain
[32] Hosp Gen Univ Elche, Dept Colorectal & Gastrointestinal Surg, Alicante 03203, Spain
[33] Hosp Reina Sofia, Gastroenterol Dept, IMIBIC, Cordoba 14004, Spain
[34] Hosp Gen Granollers, Gastroenterol Dept, Granollers 08042, Spain
[35] Hosp Nuestra Sanora de la Candelaria, Gastroenterol Dept, Tenerife 38010, Spain
[36] Hosp Royo Villanova, Gastroenterol Dept, Zaragoza 50007, Spain
[37] Complejo Hosp Soria, Gastroenterol Dept, Soria 42005, Spain
[38] Hosp Univ Henares, Gastroenterol Dept, Coslada 28002, Spain
[39] Hosp Univ Infanta Leonor, Gastroenterol Dept, Madrid 28031, Spain
[40] Complejo Hosp Univ Pontevedra, Gastroenterol Dept, Pontevedra 36071, Spain
[41] Hosp Alvaro Cunqueiro Vigo, Gastroenterol Dept, Vigo 36312, Spain