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Tanmoun, N.; Raungrongmorakot, K.; Ruangvutilert, P.; Boriboonhirunsarn, D.; Tontisirin, P.; Butsansee, W. Correlation of Cervical Length Obtained from Transperineal Ultrasonography, Transvaginal Ultrasonography and Digital Examination. Thai J Obstet Gynaecol 2017, 15, 137-144.