Caroline HG Bastiaenen , Rob A de Bie , Johan WS Vlaeyen , Mariëlle EJB Goossens , Pieter Leffers , Pieter MJC Wolters , Janneke M Bastiaanssen , Piet A van den Brandt and Gerard GM Essed
BMC Pregnancy and Childbirth 2008, 8:19doi:10.1186/1471-2393-8-19
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