Hugh A. Cassiere et al. 2021. Converting Bi-Level Positive Airway Pressure Machines into Ventilators for Hospitalized Coronavirus Disease-2019 Patients: Emergency Use Protocol. Research and Practice in Anesthesiology. 5, 1 (Nov. 2021), 5–7. DOI:https://doi.org/10.17140/RPAOJ-5-128.