Juárez-Villa Daniel et al. 2021. A Literature Review of Prone Position in Non-intubated Patients with COVID-19 as a Useful Maneuver to Avoid Mechanical Ventilation. Highlights on Medicine and Medical Research Vol. 11. (May 2021), 72–85. DOI:https://doi.org/10.9734/bpi/hmmr/v11/2500E.