A note of caution on correlation between sibling pairs.
de la Fuente-Fernández
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D017668:Age of Onset; D015986:Confounding Factors, Epidemiologic; D003430:Cross-Sectional Studies; D006801:Humans; D010300:Parkinson Disease / Q000453:epidemiology / Q000235:genetics*; D012107:Research Design; D015983:Selection Bias; D035781:Siblings