[1] Hosp Univ La Princesa, Inst Invest Sanitaria Princesa IP, Ctr Invest Biomed Red Enfermedades Hepat & Digest, Serv Aparato Digest, Madrid, Spain
[2] Hosp Sabadell, CIBEREHD, Serv Aparato Digest, Barcelona, Spain
[3] Hosp Fuenlabrada, Serv Aparato Digest, Madrid, Spain
[4] Hosp Ramon & Cajal, Serv Aparato Digest, E-28034 Madrid, Spain
[5] Hosp del Mar, Serv Aparato Digest, Barcelona, Spain
[6] Univ Pais Vasco UPV EHU, Serv Aparato Digest, CIBEREHD, Hosp Donostia Inst Biodonostia, San Sebastian, Spain
[7] Hosp Valme, Serv Aparato Digest, CIBEREHD, Seville, Spain
[8] Univ Santiago de Compostela, Hosp Clin, Serv Aparato Digest, Santiago De Compostela, Spain
[9] Hosp Clin Barcelona, CIBEREHD, Serv Aparato Digest, Barcelona, Spain
[10] Hosp Matua Terrassa, CIBEREHD, Serv Aparato Digest, Barcelona, Spain
[11] Hosp Sabadell, CIBEREHD, Serv Urgencias, Barcelona, Spain
[12] Hosp Clin, CIBEREHD, Serv Aparato Digest, Zaragoza, Spain
[13] Ctr Med Teknon, Serv Aparato Digest, Barcelona, Spain
[14] Hosp San Pedro Alcantara, Serv Aparato Digest, Caceres, Spain
[15] Hosp San Jorge, Serv Aparato Digest, Huesca, Spain
[16] Agencia Sanitaria Costa del Sol, Serv Aparato Digest, Malaga, Spain
[17] Hosp Donostia, Microbiol Serv, San Sebastian, Spain