[1] Univ Naples Federico 2, Naples, Italy
[2] AO Monaldi, Naples, Italy
[3] Univ Ferrara, I-44100 Ferrara, Italy
[4] AO Emanuele, Catania, Italy
[5] AO San Giovanni Moscati, Avellino, Italy
[6] Univ Messina, Messina, Italy
[7] Univ Naples 2, Naples, Italy