Lucchini, Alberto, et al. “Water Content of Delivered Gases During Helmet Continuous Positive Airway Pressure in Healthy Subjects: Humidification During Helmet CPAP”. Acta Biomedica Atenei Parmensis, vol. 90, no. 11-S, Nov. 2019, pp. 65-71, https://doi.org/10.23750/abm.v90i11-S.8820.