[1] Hosp Gen Univ Valle de Hebron, Serv Hepatol, Barcelona 08035, Spain
[2] GlaxoSmithKline SA, Madrid, Spain
[3] Univ Navarra, Clin Univ, Med Interna Serv, E-31080 Pamplona, Spain
[4] Hosp Univ Virgen de la Arrixaca, Serv Digest, Murcia, Spain
[5] Hosp Na Sa de la Candelaria, Serv Digest, Santa Cruz de Tenerife, Spain
[6] Hosp Univ Marques Valdecilla, Serv Digest, Santander, Spain
[7] Hosp Gen Univ La Fe, Valencia, Spain
[8] Hosp Clin Barcelona, Inst Malaties Digest, Serv Hepatol, Barcelona, Spain