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** Título [[image:lupa.jpg width="383" height="340" align="right"]] **

 * HighWire Press (Stanford University)
 * ISI Web of Knowledge(Requiere suscripción)
 * Latindex
 * NCBI-National Center for Biotechnology Information
 * ScienceDirect
 * Scirus
 * TOXNET (Toxicology Data Network)

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