| M M L H Wassen Women's prelabour preference for epidural analgesia: a cross-sectional study among women from the Netherlands and BelgiumMartine Wassen Department of Obstetrics and Gynecology, Maastricht University Medical Center, P Debyelaan 25, Maastricht, The Netherlands J Psychosom Obstet Gynaecol 34:22-8. 2013 Early versus late epidural analgesia and risk of instrumental delivery in nulliparous women: a systematic reviewM M L H Wassen Department of Obstetrics and Gynaecology, Maastricht University Medical Centre, Maastricht, The Netherlands BJOG 118:655-61. 2011
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