Hasan, M. M., and M. Zaki. “Obstructive Sleep Apnea Syndrome- A Life Threatening Sleep Disorder: Proper Diagnosis and Treatment Is Essential”. Bangladesh Journal of Dental Research &Amp; Education, vol. 2, no. 2, Aug. 2013, pp. 62-64, doi:10.3329/bjdre.v2i2.16247.