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[The Journals role in continuing medical education].

In the 19th century, the first journals in medicine appeared in order to disseminate knowledge among creators and discoverers, but especially among users of knowledge, some of these journals continue to be published nowadays. Subsequently, an organization that initially aspired to collect, sort, archive and distribute the publications: the Index Medicus. Over time, it was imperative to create indexes that measure the performance of journals and with that of researchers.