Efficacy and safety of umbilical cord mesenchymal stem cells for the treatment of patients with COVID-19. Clinics, [S. l.], v. 76, p. e2604, 2021. DOI: 10.6061/clinics/2021/e2604. Disponível em: https://www.revistas.usp.br/clinics/article/view/192049.. Acesso em: 29 apr. 2024.