DOI:
10.1055/s-00000022
Das Gesundheitswesen
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References
Hoffmann F, Andersohn F, Giersiepen K. et al.
[Validation of secondary data. Strengths and limitations].
Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz 2008;
51: 1118-1126
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