Inthaphan, Jutharat, Orawan Kaewboonchoo, Plernpit Boonyamalik, and Charnchudhi Chanyasanha. “Factors Related to Respiratory Symptoms Among Workers of A Highway District in Eastern Region”. Journal of Public Health Nursing 35, no. 1 (April 30, 2021): 53-68. Accessed October 28, 2021. https://he01.tci-thaijo.org/index.php/phn/article/view/248692.