PRKN and Parkinson disease: The analysis of the PD screening questionnaire revealed that a higher number of heterozygous carriers of a PRKN mutation reported that “their feet seem to get stuck to the floor” (symptom question 5) (p = 0.006, alpha set at 0.0045 after Bonferroni correction) as compared to non-carriers, indicating a detectable increase in an akinesia-related phenotype (Supplementary Table 1).