[1] Meyer Childrens Hosp IRCCS, Florence, Italy
[2] Univ Bologna, Dept Med & Surg Sci DIMEC, Neonatal Intens Care Unit, IRCCS AOU Bologna, Bologna, Italy
[3] Univ Florence, Dept Stat Comp Sci Applicat G Parenti, Florence, Italy
[4] Careggi Univ Hosp Florence, Div Neonatol, Florence, Italy