1. Hospital Universitario de Torrejón and School of Medicine Universidad Francisco de Vitoria Madrid Spain
2. Fetal Medicine Research Institute King's College Hospital London UK
3. Medway Maritime Hospital, Gillingham UK
4. Institute of Medical Sciences Canterbury Christ Church University Chatham UK
5. Hospital Clínico Universitario Virgen de la Arrixaca Murcia Spain
6. Hospital Universitario San Cecilio Granada Spain
7. Shterev Hospital Sofia Bulgaria
8. Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico Milan Italy
9. Department of Clinical Science and Community Health University of Milan Milan Italy
10. University Women's Hospital Tuebingen Germany
11. Centro Hospitalar Universitário de Lisboa Central Lisbon Portugal