T. Netsirininkul, . C. Termsarasab, N. Kongkit, . P. . Sennunta, C. Techawong, and S. Suanpoot, “Comparison Study of Cervical Lengths between Preterm and Term Pregnant Women among the Low-Risk Women with Normal Mid-trimester Cervical Length”, Lampang Med J, vol. 41, no. 2, pp. 49–57, Feb. 2021.