Inthayote, K., P. Sannlamoon, H. Auedsug, S. Chaichoomphu, and S. Puatumm. “Risk Factors for Death Among Preterm Infants With Respiratory Distress Syndrome at Lampang Hospital”. Journal of Health Science of Thailand, vol. 28, no. 1, Mar. 2019, pp. 108-16, https://thaidj.org/index.php/JHS/article/view/5913.