[1] Puerta de Hierro Univ Hosp, Dept Gastroenterol, Madrid, Spain
[2] Hosp Univ La Princesa, Dept Gastroenterol, Inst Invest Sanitaria Princesa IP, Madrid, Spain
[3] Hosp Univ La Princesa, Ctr Invest Biomed Red Enfermedades Hepat & Digest, Inst Invest Sanitaria Princesa IP, Madrid, Spain