References
^ Yentis, Steve (2014). Analgesia, Anaesthesia and Pregnancy : A Practical Guide, CAMBRIDGE UNIVERSITY PRESS. BiggerBooks. ISBN 9781107601598 (revised Nov 2023)^ (2013). Analgesia, Anaesthesia and Pregnancy : A Practical Guide ECampus. ISBN 9781107601598 (revised Apr 2015)
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