[1] Bambino Gesu Pediat Hosp, Dept Neurosci & Neurorehabil, Unit Clin Psychol, I-00164 Rome, Italy
[2] Bambino Gesu Pediat Hosp, Epidemiol Unit, I-00164 Rome, Italy
[3] Bambino Gesu Pediat Hosp, Dept Neonatal Med & Surg, I-00164 Rome, Italy
[4] Bambino Gesu Pediat Hosp, Dept Pediat Surg, I-00164 Rome, Italy