Urea breath test for the detection of Helicobacter pylori using a stable isotope ('ANTPOT. 13C') - Castro, Ana Paula Werneck de; Gomes, Ana Thereza Britto; Padovan, Gilberto João; Oliveira, Ricardo Brandt de; Marchini, Julio Sergio (Jornal Brasileiro de Patologia e Medicina Laboratorial, 2004)