Tutschek_et_al-2016-UOG-Angle of fetal head progression measured using transperineal ultrasound as a predictive factor of vacuum extraction failure.pdf
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Tutschek B, Braun T, Chantraine F, Henrich W. A study of progress of labour using intrapartum translabial ultrasound, assessing head station, direction, and angle of descent. BJOG 2011; 118: 62–69.
