Association between chorionicity and preterm birth in twin pregnancies: a systematic review involving 29 864 twin pregnancies.
Shemoon MarleenC DiasR NandasenaR MacGregorJohn AlloteyJ AquilinaA KhalilS ThangaratinamPublished in: BJOG : an international journal of obstetrics and gynaecology (2020)
In twin pregnancies, monochorionicity is associated with an increased risk of preterm birth at all gestations.