1. Woman’s and Child’s Health Department, Padua University Hospital, 45128 Padova, Italy
2. Clinical Research Unit, Padua University Hospital, 45128 Padova, Italy
3. School of Nursing and Midwifery, Queens University Belfast, Belfast BT9 7BL, UK
4. Department of Biomolecular Sciences, Service of Biostatistics, University of Urbino, 61029 Urbino, Italy