EP02.06: Effect of cervical cerclage on the recurrent risk of preterm birth after a preceding twin spontaneous preterm birth. (30th September 2019) - Kim, S.; Park, H.; Seol, H.; Bae, J.; Ahn, K.; Na, S.; Lee, M.; Lee, S.; Kwak, D.; Park, I.; Won, H.; Kim, M.; et al.