Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleCartas al editor.AuthorsArellano Penagos, Mario; Aranda Patrón, EduardoSubjectsLETTERS to the editor; VELA, Jorge Espino; PEDIATRICS -- Law &; legislation; PUBLISHING; PERIODICAL articles; BACTERIOLOGY periodicals; VACCINATIONPublicationActa Pediatrica de Mexico, 2013, Vol 34, Issue 4, p242ISSN0186-2391Publication typeArticle