sentence: All studies used established criteria to diagnose Parkinson ’ s diease ( Calne et al ., 1992 ; Hughes et al ., 1992 ; Larsen et al ., 1994 ) , and the majority ( 8 out of 11 ) used established criteria to define PD dementia ( American Psychiatric Association , 1996 ; Emre et al ., 2007 ) .