Ngerncham, Sopapan, Bua-Ngam Sudsawat, Patcharin Boonlerluk, Tanyaporn Jaroonnetr, Manutchaya Arkomwattana, and Uthaiwon Sawangsri. 2020. “Rate of Breastfeeding for 4 Months and Promoting Factors: A Cohort Study of Mothers of Preterm Infants at Siriraj Hospital”. Siriraj Medical Journal 62 (3):128-32. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/243767.