Sompradeekul, S., N. Maranetra, C. Naruman, and A. Nana. “The Prevalence of Obstructive Sleep Apnea Among Professional Hospital Drivers”. Siriraj Medical Journal, vol. 54, no. 10, Oct. 2002, pp. 625-33, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245319.