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von Elm, E; Altman, D G; Egger, M; Pocock, S J; Gøtzsche, P C; Vandenbroucke, J P (2008). [The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) statement: guidelines for reporting of observational studies]. Internist, 49(6), pp. 688-693. Heidelberg: Springer-Verlag 10.1007/s00108-008-2138-4