Veloro, L.V., Sarte, M.A.A. and Castañeda, S.S. 2008. Collar Size as Predictor of Obstructive Sleep Apnea. Philippine Journal of Otolaryngology Head and Neck Surgery. 23, 2 (Dec. 2008), 14–16. DOI:https://doi.org/10.32412/pjohns.v23i2.727.