<style face="normal" font="default" size="100%">Missing laboratory test data in electronic general practice records: analysis of rheumatoid factor recording in the clinical practice research datalink</style>

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31<style face="normal" font="default" size="100%">Missing laboratory test data in electronic general practice records: analysis of rheumatoid factor recording in the clinical practice research datalink</style><style face="normal" font="default" size="100%">Missing laboratory test data in electronic general practice records: analysis of rheumatoid factor recording in the clinical practice research datalink</style>