[1] Univ Bologna, S Orsola Malpighi Hosp, Dept Paediat Anaesthesia & Intens Care, I-40183 Bologna, Italy
[2] Univ Bologna, S Orsola Malpighi Hosp, Dept Cardiol, I-40183 Bologna, Italy
[3] Univ Bologna, S Orsola Malpighi Hosp, Dept Surg Paediat, I-40183 Bologna, Italy