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Meader, N., Mitchell, A. J., Chew-Graham, C. , Goldberg, D., Rizzo, M., Bird, V., Kessler, D., Packham, J., Haddad, M. & Pilling, S. (2011). Case identification of depression in patients with chronic physical health problems: a diagnostic accuracy meta-analysis of 113 studies.. British Journal of General Practice (BJGP), 61(593), e808 - e820. doi: 10.3399/bjgp11X613151