Numjaitaharn, Suntaree, Piangjit Tharnprisan, Ratana Rongtonggul, Puangrat Chouwajaroen, Witoon Prasertcharoensuk, and Somboon Thienthong. 2013. “A Postoperative Pain Survey in the Second Day After Cesarean Section”. Srinagarind Medical Journal 21 (1):9-16. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/13201.