Anxiety rating scales in Parkinson's disease: critique and recommendations.
Leentjens AF, Dujardin K, Marsh L, Martinez-Martin P, Richard IH, Starkstein SE, Weintraub D, Sampaio C, Poewe W, Rascol O, Stebbins GT, Goetz CG. Anxiety rating scales in Parkinson's disease: critique and recommendations. Mov Disord. 2008 Oct 30; 23(14):2015-25.