Clinical and epidemiological characteristics of Helicobacter pylori infection among patients in specialty outpatient clinics at Faculdade de Medicina ABC - Chehter, Ethel Zimberg; Maximiano, Fabio Luiz; Nogueira, Leonardo Fernando Ferrari; Blandi, Fernando Antônio; Burdelis, Ricardo Eugênio Mariani; Xavier, Maurício Fullep Ferreira; Fonseca, Fernando; Catapani, Wilson Roberto (São Paulo Medical Journal, 2007)