1. Institute of Medical GeneticsMedical University of ViennaVienna Austria
2. Institute of PathologyPhilipps University of MarburgMarburg Germany
3. Department of ObstetricsDiacovere FriederikenstiftHannover Germany
4. Department of Praenatal MedicineKlinikum OldenburgOldenburg Germany
5. Clinic of Gynaecology and ObstetricsKlinikum LeverkusenLeverkusen Germany
6. Practice for Human GeneticsHannover Germany