[1] Department of Medicine,
[2] Section of Paediatrics,undefined
[3] University of Chieti-Ospedale Policlinico,undefined
[4] Via dei Vestini 5,undefined
[5] 66100 Chieti,undefined
[6] Italy e-mail: averrott@obelix.unich.it Tel.: +39-871-574538; Fax: +39-871-574831,undefined
[7] Department of Neurology,undefined
[8] S. Valentino Hospital,undefined
[9] Italy,undefined
[10] Department of Paediatrics,undefined
[11] University of Siena,undefined
[12] Siena,undefined
[13] Italy,undefined