[1] Univ Veracruzana, Inst Invest Med Biol, Veracruz 91700, Mexico
[2] Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Dept Gastroenterol, Mexico City 14080, Mexico
[3] Hosp Star Med, Clin Especial Gastrointestinales & Hepat, Merida 97133, Yucatan, Mexico
[4] Soc Espanola Beneficencia, Dept Gastroenterol, Pachuca 42000, Hidalgo, Mexico
[5] Clin RehabilMetabol Digest & Hepat, Dept Gastroenterol, Mexico City 14080, Mexico
[6] Hosp Star Med Merida, Dept Gastroenterol, Merida 97133, Yucatan, Mexico
[7] Univ Veracruzana, Inst Invest Med Biol, C Agustin Iturbide, Veracruz 91700, Mexico