Performance of the 13C-urea breath test for the diagnosis of H. pylori infection using a substrate synthesized in Brazil: A preliminary study. Clinics, [S. l.], v. 73, p. e16–553, 2018. DOI: 10.6061/clinics/2018/e16-553. Disponível em: https://www.revistas.usp.br/clinics/article/view/146904.. Acesso em: 2 may. 2024.