To be included a study had to be a randomized controlled trial with or without bias which studied individuals between 16 and 89 years of age who were of any race, gender, education level and socioeconomic status, and who had received H. pylori eradication treatment with corroborated elimination of the microorganism.
Se seleccionaron estudios clínicos controlados aleatorizados completados o publicados hasta diciembre 31 de 2012 que cumplieran los criterios de inclusión: Estudios clínicos controlados aleatorizados con cegamiento o sin él con individuos, con edad entre los 16 y 89 años.