TY JOUR TI The structure and incidence of preterm birth in nulliparous women KW risk factors KW causes KW incidence of preterm birth in nulliparous KW ultrasound assessment KW transvaginal measurement of cervical length KW screening. JO Journal of New Medical Technologies. eJournal AU Kuzibaeva, R.. AU Khadartseva, K.. PY 2015 IS 9 PB INFRA-M Academic Publishing LLC.