<style face="normal" font="default" size="100%">Instrumental variables in the evaluation of diagnostic test procedures when the true disease state is unknown.</style>

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0<style face="normal" font="default" size="100%">Instrumental variables in the evaluation of diagnostic test procedures when the true disease state is unknown.</style><style face="normal" font="default" size="100%">Instrumental variables in the evaluation of diagnostic test procedures when the true disease state is unknown.</style>