Quantitative versus qualitative notions of validity: investigating the validity of PSYCHLOPS as a patient outcome measure in trials of insomnia and sleep problems

Davy, Zowie and Quinn, Casey and Wilson, Helen and Togher, Fiona and Siriwardena, A Niroshan (2011) Quantitative versus qualitative notions of validity: investigating the validity of PSYCHLOPS as a patient outcome measure in trials of insomnia and sleep problems. In: 40th Annual Scientific Meeting of the SAPC, 6-8 July 2011, University of Bristol, Bristol .

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