Netsirininkul, T., Termsarasab, .C., Kongkit, N., Sennunta, .P. , Techawong, C. and Suanpoot , S. 2021. Comparison Study of Cervical Lengths between Preterm and Term Pregnant Women among the Low-Risk Women with Normal Mid-trimester Cervical Length. Lampang Medical Journal. 41, 2 (Feb. 2021), 49–57.