Overview Vaginal Progesterone in Twins With Short Cervix Status: Withdrawn Trial end date: 2018-08-01 Target enrollment: Participant gender: Summary A Multicenter, Double-Blind, Placebo-Controlled Randomized Clinical Trial of Vaginal Progesterone to Prevent Early Preterm Birth In Twin Pregnancy with Short Cervix. Phase: Phase 2/Phase 3 Details Lead Sponsor: Obstetrix Medical GroupTreatments: ProgesteroneProgestins