http://portal.neumopediatriacolombia.com/wp-content/uploads/2017/03/laringotraqueobronquitis.pdf
https://encolombia.com/medicina/revistas-medicas/pediatria/vp-383/pediatria38303-crup/
http://www.imss.gob.mx/sites/all/statics/guiasclinicas/258GRR.pdf
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