Techawathakul, S., A. Ratinthorn, C. Yusamran, and D. Boriboonhirunsarn. “Risk Factors Related to Preeclampsia”. Nursing Science Journal of Thailand, vol. 32, no. 1, Dec. 2014, pp. 61-70, https://he02.tci-thaijo.org/index.php/ns/article/view/27061.