1. Department of Obstetrics and Gynecology, University Hospital of Parma, Parma, Italy
2. Institute of Clinical Physiology, National Council Research, Lecce, Italy
3. National Center for Fetal Medicine, Trondheim University Hospital (St. Olavs Hospital), Trondheim, Norway
4. Department of Laboratory Medicine, Children’s and Women’s Health, Norwegian University of Science and Technology, Trondheim, Norway
5. Amolab S.R.L., Lecce, Italy