E H C Liu, A T H Sia
Liu E H C, Sia A T H.
Rates of caesarean section and instrumental vaginal delivery in nulliparous women after low concentration epidural infusions or opioid analgesia: systematic review
BMJ 2004; :bmj;bmj.38097.590810.7Cv1
doi:10.1136/bmj.38097.590810.7C