(Q51032840)
Statements
A high response is not essential to prevent selection bias: results from the Leiden 85-plus study. (English)
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R G J Westendorp
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A Bootsma-van der Wiel
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E van Exel
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A J M de Craen
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J Gussekloo
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A M Lagaay
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D L Knook
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1 November 2002
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55
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11
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1119-1125
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