Affiliation: | (1) Hospital Central de Asturias and School of Medicine, University of Oviedo, Oviedo, Asturias, Spain, ES;(2) Pediatría. Facultad de Medicina. c/Julián Clavería 6, 33006 Asturias, Spain e-mail: fsantos@sci.cpd.uniovi.es Tel.: +34-985103585, Fax: +34-985103606, ES |