Chawanpaiboon, S., S. Sawasdimongkol, S. Rongroen, S. Worapitaksanond, and K. Phopathom. “Comparison of Risk Factors and Outcome of Delivery between Preterm and Term Delivery: 1-Year Study (2008 BE) at Siriraj Hospital”. Thai Journal of Obstetrics and Gynaecology, vol. 17, no. 3, May 2012, pp. 155-62, https://he02.tci-thaijo.org/index.php/tjog/article/view/1617.