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Disease-specific anxiety symptomatology in Parkinson's diseaseDissanayaka, Nadeeka N. W.; O'Sullivan, John D.; Pachana, Nancy A.; Marsh, Rodney; Silburn, Peter A.; White, Elizabeth X.; Torbey, Elizabeth; Mellick, George D.; Copland, David A.; Byrne, Gerard J. · International Psychogeriatrics · 2016