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Tutschek, B; Braun, T; Chantraine, F; Henrich, W (2011). A study of progress of labour using intrapartum translabial ultrasound, assessing head station, direction, and angle of descent. BJOG - an international journal of obstetrics and gynaecology, 118(1), pp. 62-9. Oxford: Blackwell Science 10.1111/j.1471-0528.2010.02775.x
