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Medical record review to recover missing data in a Portuguese birth cohort: agreement with self-reported data collected by questionnaire and inter-rater variability

Elisabete Alves, Nuno Lunet, Sofia Correia, Vítor Morais, Ana Azevedo, Henrique Barros
10.1016/j.gaceta.2010.10.013
Gac Sanit. 2011;25:211-9
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Gaceta Sanitaria