Manavathongchai, Manutham, Tarita Jaruchanapongtorn, and Panadda Suwan. 2018. “Prevalence and Risk Factors of Incorrect Inhaler Technique in Asthmatic Children at Faculty of Medicine Vajira Hospital”. Vajira Medical Journal : Journal of Urban Medicine 62 (5):345-56. https://he02.tci-thaijo.org/index.php/VMED/article/view/194555.