1. Academic Medical Center; Department of Vascular Medicine; Meibergdreef 9 Amsterdam Netherlands 1105 AZ
2. Westfriesgasthuis; Obstetrics and Gynaecology; Maelsonstraat 3 P.O. Box 600 Hoorn Noord Holland Netherlands 1620 AR
3. University "G. D'Annunzio" of Chieti-Pescara; Department of Medical, Oral and Biotechnological Sciences; via dei Vestini 31 Chieti Italy 66013
4. Academic Medical Center University of Amsterdam; Center for Reproductive Medicine, Department of Obstetrics and Gynaecology; Meibergdreef 9 Amsterdam Netherlands 1100 DE