Na Nan, C., S. Songthamwat, U. Summart, and M. Songthamwat. “Complications of Advanced Maternal Age Pregnancy: A Retrospective Cohort Study”. Srinagarind Medical Journal, vol. 37, no. 3, June 2022, pp. 197-05, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/254142.