pubmed-article:19902132 | pubmed:affiliation | Department of Obstetrics and Gynaecology, Radboud University Nijmegen Medical Centre, 791, Secretariaat Obstetrie and Gynaecologie, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands. m.withagen@obgyn.umcn.nl | lld:pubmed |