TY - JOUR AU - Hickok, D E; Gordon, D C; Milberg, J A; Williams, M A; Daling, J R TI - The frequency of breech presentation by gestational age at birth: a large population-based study JO - Am J Obstet Gynecol IS - 03 VL - 166 PY - 1992 DO - 10.1016/0002-9378(92)91347-D L3 - PubMed-ID: 1550152 SP - 851 EP - 852 ER -