<style face="normal" font="default" size="100%">Evaluation of the General Practice Research Database congenital heart defects prevalence: comparison to United Kingdom national systems</style>

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31<style face="normal" font="default" size="100%">Evaluation of the General Practice Research Database congenital heart defects prevalence: comparison to United Kingdom national systems</style><style face="normal" font="default" size="100%">Evaluation of the General Practice Research Database congenital heart defects prevalence: comparison to United Kingdom national systems</style>