Jarungjitaree, Suwannee, Nuananong Chaipiyaporn, Anoma Santiworakul, and Salila Cetthakrikul. 2013. “Effect of Smoking on Physical Activity Level and Pulmonary Function of Vocational Students in Bangkok”. Srinagarind Medical Journal 25 (4):287-91. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/12948.