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2 Farrance I, "Uncertainty of measurement: a review of the rules for calculating uncertainty components through functional relationships" 33 : 49-75, 2012
3 Sousa VD, "Translation, adaptation and validation of instruments or scales for use in cross-cultural health care research: a clear and user-friendly guideline" 17 : 268-274, 2011
4 Pringsheim T, "The prevalence of Parkinson’s disease: a systematic review and meta-analysis" 29 : 1583-1590, 2014
5 Movement Disorder Society Task Force on Rating Scales for Parkinson’s Disease, "The Unified Parkinson’s Disease Rating Scale (UPDRS): status and recommendations" 18 : 738-750, 2003
6 Leentjens AF, "The Parkinson Anxiety Scale (PAS): development and validation of a new anxiety scale" 29 : 1035-1043, 2014
7 Glosup JG, "Systematic error revisited" Lawrence Livermore National Lab
8 Marinus J, "Risk factors for non-motor symptoms in parkinson’s disease" 17 : 559-568, 2018
9 Roberts P, "Reliability and validity in research" 20 : 41-45, 2006
10 Terwee CB, "Quality criteria were proposed for measurement properties of health status questionnaires" 60 : 34-42, 2007
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