[1] Univ Extremadura, Dept Pharmacol & Psychiat, E-06071 Badajoz, Spain
[2] Univ Extremadura, Dept Biochem & Mol Biol & Genet, E-06071 Badajoz, Spain
[3] Univ Complutense Madrid, Hosp Clin Carlos, Gastroenterol Serv, Madrid, Spain
[4] Univ Complutense Madrid, Hosp Clin Carlos, Serv Oncol, Madrid, Spain