1 Department of Obstetrics, Gynecology and Fetal Medicine, University Hospital Center of Tours, 2, boulevard Tonnellé, 37044 Tours Cedex 9, France; UMR INSERM U930, François-Rabelais University, 2, boulevard Tonnellé, 37044 Tours Cedex 9, France. Electronic address: emmanuel.simon@univ-tours.fr.
2 Department of Obstetrics, Gynecology and Fetal Medicine, University Hospital Center of Tours, 2, boulevard Tonnellé, 37044 Tours Cedex 9, France; UMR INSERM U930, François-Rabelais University, 2, boulevard Tonnellé, 37044 Tours Cedex 9, France.