N. Buathum, P. Punpuckdeekoon, and N. Imsom-somboon, “The Reliability of Transabdominal Cervical Length Measurement Compared with Transvaginal Measurement at 16-24 Weeks of Gestation”, Thai J Obstet Gynaecol, vol. 27, no. 3, pp. 165–173, Jul. 2019.