TY - JOUR AU - Bibbo, C; Rouse, C E; Cantonwine, D E; Little, S E; McElrath, T F; Robinson, J N TI - Angle of progression on ultrasound in the second stage of labor and spontaneous vaginal delivery JO - Am J Perinatol IS - 04 VL - 35 PY - 2018 DO - 10.1055/s-0037-1608633 L3 - PubMed-ID: 29112996 SP - 413 EP - 420 ER -