TY - JOUR AU - Dagenais, C; Lewis-Mikhael, A M; Grabovac, M TI - What is the safest mode of delivery for extremely preterm cephalic/non-cephalic twin pairs? A systematic review and meta-analyses JO - BMC Pregnancy Childbirth VL - 17 PY - 2017 DO - 10.1186/s12884-017-1554-7 L3 - PubMed-ID: 29187166 SP - 397 N1 - et al. ER -