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. 2018 Sep 5;33(10):1591–1600. doi: 10.1002/mds.64

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© 2018 The Authors. Movement Disorders published by Wiley Periodicals, Inc. on behalf of International Parkinson and Movement Disorder Society.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Quality control. (A) Quantile‐quantile‐plots of association for common variants using chi‐square for Parkinson's Progression Markers Initiative and logistic regression with significant principal components (3 and 6) as covariates for ParkWest. (B) Population stratification (multidimensional scaling) against HapMap populations (CEU, Utah residents with Northern and Western European ancestry; CHB, Han Chinese in Beijing, China; JPT, Japanese in Tokyo, Japan; YRI, Yoruba in Ibadan, Nigeria). (C) Multidimensional scaling plots show no stratification between cases and controls in any of the cohorts. All plots are based on data after quality control. C1, first principal component; C2, second principal component.