3 Department of Obstetrics and Gynaecology, Betsi Cadwaladr University Health Board, Bangor, Gwynedd LL57 2PW, UK.
4 Department of Obstetrics and Gynaecology, Helsinki University Central Hospital, Helsinki, Finland.
5 Department of Obstetrics and Gynaecology, Hôpital Nord, APHM, Aix-Marseille University (AMU), Univ Avignon, CNRS, IRD, IMBE UMR 7263, 13397, Marseille, France.
6 Département d'Anatomopathologie, Laboratoire Cerba, 95066 Cergy Pontoise, France.
7 Department of Obstetrics and Gynecology, Medical University of Graz, Auenbruggerplatz 14, 8036 Graz, Austria.