Dias-Vaz, M., Tiago, C., Morais, A., Ferreira, M. and Carvalho, F. 2020. Elective Tracheostomy in COVID-19 Patients: A Retrospective Case Series. Journal of the Portuguese Society of Anesthesiology. 29, 2 (Aug. 2020), 72–76. DOI:https://doi.org/10.25751/rspa.20118.