Excepto si se señala otra cosa, la licencia del ítem se describe como 2020 Published by Elsevier Espa ̃na, S.L.U. on behalf ofAsociaci ́on Espa ̃nola de Pediatr ́ıa. This is an open access articleunder the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).(http://creativecommons.org/licenses/by-nc-nd/4.0/)