[1] Univ Barcelona, IDIBAPS, Hosp Clin, Inst Malalt Digest,Liver Unit, Barcelona, Spain
[2] Univ Barcelona, IDIBAPS, Hosp Clin, DNA Unit, Barcelona, Spain
[3] Univ Barcelona, IDIBAPS, Hosp Clin, Hemotherapy & Hemostasis Lab, Barcelona, Spain
[4] Univ Barcelona, IDIBAPS, Hosp Clin, Hormonal Lab, Barcelona, Spain
[5] Hosp Ramon y Cajal, Dept Gastroenterol, E-28034 Madrid, Spain
[6] Clin Hosp Ctr Rebro, Dept Gastroenterol, Zagreb, Croatia
[7] Pfizer Global Pharmaceut, Skokie, IL USA