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VON ELM, Erik and INICIATIVA STROBE et al.Declaración de la Iniciativa STROBE (Strengthening the Reporting of Observational studies in Epidemiology): directrices para la comunicación de estudios observacionales. Gac Sanit [online]. 2008, vol.22, n.2, pp.144-150.
ISSN 0213-9111.