EP01.23: Serial measurements of cervical elastography for prediction of preterm birth in twin pregnancies during the second trimester. (14th September 2022) - Kwon, J.; Park, K.; Seol, H.; Pyeon, S.; Jung, Y.; Kwon, H.; Kwon, J.; Park, H.; Seong, W.; Kim, H.; Hwang, H.; Sung, J.; et al.