Lobbamrung, K., Daramas, T. and Wittayasooporn, J. (2019) “The Effect of Oropharyngeal Colostrum Administration on Immunoglobulin A in Preterm Infants”, Ramathibodi Nursing Journal, 25(1), pp. 16–28. Available at: https://he02.tci-thaijo.org/index.php/RNJ/article/view/122435 (Accessed: 19 August 2022).