[1] Paediatric Intensive Care Unit,
[2] Gregorio Marañón University Hospital,undefined
[3] Dr Castelo 49,undefined
[4] E-28009 Madrid,undefined
[5] Spain e-mail: pielvi@mx4.redestb.es Tel.: + 34-1-5 86 67 08 Fax: + 34-1-5 86 80 18,undefined
[6] Paediatric Intensive Care Unit,undefined
[7] Galicia General Hospital,undefined
[8] c/Galeras s/n,undefined
[9] E-15705 Santiago de Compostela,undefined
[10] Spain,undefined