MATTAR, R. Breath tests for gastrointestinal diseases - will it be safe to conduct breath tests after the COVID-19 pandemic?. Clinics, [S. l.], v. 75, p. e2092, 2020. DOI: 10.6061/clinics/2020/e2092. Disponível em: https://www.revistas.usp.br/clinics/article/view/171454. Acesso em: 28 jul. 2021.