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2. Carod-Artal FJ, Ribeiro Lda S, Kummer W, Martinez-Martin P. (2010). Psychometric properties of the SCOPA-AUT Brazilian Portuguese version. Movement Disorders 25(2):205-12.
3. Martinez-Martin P, Prieto-Jurczynska C, Frades-Payo B. (2009). [Psychometric attributes of the Parkinson's Disease-Cognitive Rating Scale An independent validation study]. Revista de Neurologia 49(8):393-8.
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8. Leentjens AF, Dujardin K, Marsh L, Martinez-Martin P, et al. (2008). Anxiety rating scales in Parkinson's disease: critique and recommendations. Movement Disorders 23(14):2015-25.
9. Martinez-Martin P, Carod-Artal FJ, da Silveira Ribeiro L, Ziomkowski S, et al. (2008). Longitudinal psychometric attributes, responsiveness, and importance of change: An approach using the SCOPA-Psychosocial questionnaire. Movement Disorders 23(11):1516-23.
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