Frade, Luciana, Nuno Carreira, Valentina Tosatto, Sara Marote, and Isabel Galriça Neto. 2021. “Oxygen Therapy in Advanced Disease: Do You Know the Evidence?”. Internal Medicine 26 (4). Lisboa, Portugal:320-25. https://doi.org/10.24950/rspmi/Revisao/75/19/4/2019.