Thanapa Rekhawasin Pinnington และ Jenjira Arthan; Chulaluk Komoltri; Pharuhas Chanprapaph. (2024) Accuracy of the Combined First Trimester Down Syndrome Screening Test and the Optimum Range of the Cut-off Point for Intermediate-risk Identification: Twelve years' experience. <i>Thai Journal of Obstetrics and Gynaecology</i>, <i>32</i>(4), 269-277.Thanapa Rekhawasin Pinnington และ Jenjira Arthan; Chulaluk Komoltri; Pharuhas Chanprapaph. "Accuracy of the Combined First Trimester Down Syndrome Screening Test and the Optimum Range of the Cut-off Point for Intermediate-risk Identification: Twelve years' experience". Thai Journal of Obstetrics and Gynaecology 32 (2024):269-277.Thanapa Rekhawasin Pinnington และ Jenjira Arthan; Chulaluk Komoltri; Pharuhas Chanprapaph. Accuracy of the Combined First Trimester Down Syndrome Screening Test and the Optimum Range of the Cut-off Point for Intermediate-risk Identification: Twelve years' experience. PIMDEE Co. Ltd.:ม.ป.ท. 2024.