Chehter, E.Z., Maximiano, F.L., Nogueira, L.F.F., Blandi, F.A., Burdelis, R.E.M., Xavier, M.F.F., Fonseca, F. and Catapani, W.R. 2007. Clinical and epidemiological characteristics of Helicobacter pylori infection among patients in specialty outpatient clinics at Faculdade de Medicina ABC. São Paulo Medical Journal. 125, 5 (Sep. 2007), 300–301.