Psychological Medicine · 1997 · 185 citations · 18 references
These findings appear to be most consistent with theories proposing that hallucinations result from an external attributional bias for internal events. The implications of these results for research and practice are also discussed.
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The Hospital Anxiety and Depression Scale
A. S. Zigmond, R. P. Snaith · Acta Psychiatrica Scandinavica · 1983 · 45.5K citations
Paul Chadwick, Max Birchwood · The British Journal of Psychiatry · 1994 · 801 citations