Tekasakul, P. “Prevalence of Gestational Diabetes Mellitus before 24 Week Gestational Age at Taksin Hospital, Bangkok Metropolitan Administration”. Vajira Medical Journal : Journal of Urban Medicine, vol. 50, no. 2, Sept. 2011, pp. 87-93, https://he02.tci-thaijo.org/index.php/VMED/article/view/278.