Enabor OO, Olayemi OO, Bello FA, Adedokun BO. Cervical ripening and induction of labour-awareness, knowledge and perception of antenatal attendees in Ibadan, Nigeria. Journal of Obstetrics and Gynaecology. 2012 Sep 04;32(7):652–6. doi: 10.3109/01443615.2012.657271.