R. Agarwal, R. K. Saini, A. Rajpal, R. Agrawal, and A. Kumar, “Evaluation of non-invasive ventilation compliance in obstructive sleep apnea syndrome or obesity hypoventilation syndrome patients: an observational study”, Int J Res Med Sci, vol. 8, no. 12, pp. 4292–4295, Nov. 2020.