[1] IDIM, Libertad 836, RA-1012 Buenos Aires, DF, Argentina
[2] Univ Salvador, Catedra Osteol & Metab Mineral, Buenos Aires, DF, Argentina
[3] Univ Salvador, Hosp Gastroenterol Dr C Bonorino Udaondo, Dept Med, Secc Intestino Delgado, Buenos Aires, DF, Argentina
[4] Univ Salvador, Fac Med, Catedra Gastroenterol, Buenos Aires, DF, Argentina