S. Kumar, T. Rai, A. N. Aslami, and B. Alwa, “A comparative study on quadrupedal and non-quadrupedal head position on recovery from chronic maxillary sinusitis in a tertiary hospital of Rohtas district, Bihar, India”, Int J Otorhinolaryngol Head Neck Surg, vol. 4, no. 3, pp. 686–689, Apr. 2018.