Al Lawati, R., M. A. Al Abri, B. Kuppuswamy, A. Al-Kharousi, A. Y. Al-Atbi, S. Rizvi, and M. Dikshit. “The Effect of Change in Posture on Spirometry in Patients With Obstructive Sleep Apnoea Syndrome”. Sultan Qaboos University Medical Journal, vol. 19, no. 4, Dec. 2019, pp. e310-315, doi:10.18295/squmj.2019.19.04.006.