Punthumapol, Chanvitya. 2011. “A Randomized Controlled Trial of A Regular Diet as The First Meal Compared with Traditional Feeding in Patients Undergoing Cesarean Section”. Vajira Medical Journal : Journal of Urban Medicine 49 (1):1-9. https://he02.tci-thaijo.org/index.php/VMED/article/view/242.