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GDs are defined as false beliefs about having inflated worth, power, knowledge or a special identity which are firmly sustained despite undeniable evidence to the contrary (APA, 2000). Some examples are given in Table 1. GDs, like other delusional beliefs, are multidimensional (Garety & Hemsley, 1994), varying with regard to the degree of conviction and preoccupation, and the levels of distress and dysfunction caused. GDs (alongside religious delusions) seem to be held with the greatest