8. Leelasittikul K., Koonkumchoo P., Buranapuntalug S., Pongpanit, K., Yuenyongchaiwat K. Effect of air quality on cardio-respiratory systems in Northern Thailand (Chiang Mai, Chiang Rai and Nan Province). Chiang Mai University Journal of Natural Sciences 2020; 19(4): 702-717.