[1] Hosp Univ La Princesa, IIS IP, Madrid, Spain
[2] CIBERehd, Gastroenterol Unit, Madrid, Spain
[3] Hosp Univ Fuenlabrada, Gastroenterol Unit, Madrid, Spain
[4] Univ Basque Country, Hosp Donostia, Inst Biodonostia, Guipuzcoa, Spain
[5] CIBEREHD, Gastroenterol Unit, Guipuzcoa, Spain
[6] Hosp Galdakao, Gastroenterol Unit, Vizcaya, Spain
[7] Hosp Clin Univ San Carlos, Madrid, Spain
[8] IdISSC, Gastroenterol Unit, Madrid, Spain
[9] Hosp Gen Gregorio Maranon, Madrid, Spain
[10] IiSGM, Gastroenterol Unit, Madrid, Spain