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M Barkham , T Mullin , C Leach , WB Stiles , M Lucock (2007). Stability of the CORE-OM and BDI-I: psychometric properties and implications for routine practice. Psychology and Psychotherapy: Theory, Research, and Practice 80, 269–278.
M Barkham , A Rees , WB Stiles , GE Hardy , DA Shapiro (2002). Dose-effect relations for psychotherapy of mild depression: a quasi-experimental comparison of effects of 2, 8, and 16 sessions. Psychotherapy Research 12, 463–474.
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C Leach , M Lucock , M Barkham , WB Stiles , R Noble , S Iveson (2006). Transforming between Beck Depression Inventory and CORE-OM scores in routine clinical practice. British Journal of Clinical Psychology 45, 153–166.
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DM Clark , CG Fairburn , S Wessely (2008). Psychological treatment outcomes in routine NHS services: a commentary on Stiles et al. (2007). Psychological Medicine 38, 629–634. Published online: 9 October 2007. doi: 10.1017/S0033291707001869.
WB Stiles , M Barkham , J Mellor-Clark , J Connell (2008). Effectiveness of cognitive-behavioural, person-centred, and psychodynamic therapies in UK primary-care routine practice: replication in a larger sample. Psychological Medicine 38, 677–688. Published online: 10 September 2007. doi: 10.1017/S0033291707001511.