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2. Complementary and alternative therapies for pain management in labour;Smith;Cochrane Database of Systematic Reviews,2006
3. Maternal satisfaction with childbirth and intrapartum analgesia in nulliparous labour;Dickinson;Australian and New Zealand Journal of Obstetric and Gynaecology,2003
4. Epidural versus non-epidural or no analgesia in labour;Anim-Somuah;Cochrane Database of Systematic Reviews,2005
5. Ultrasound-facilitated epidurals and spinals in obstetrics;Carvalho;Anesthesiology Clinics,2008