Reopening borders: protocols for resuming travel during the COVID-19 pandemic. Clinics, [S. l.], v. 76, p. e2723, 2021. DOI: 10.6061/clinics/2021/e2723. Disponível em: https://journals.usp.br/clinics/article/view/192069.. Acesso em: 9 jun. 2024.