VAMP4 and Parkinson disease: Meta-analysis of the effect of VAMP4 rs11578699 (the genome-wide significant association in a recent large-scale PD GWAS) on AAO in LRRK2 p.G2019S parkinsonism was not significant for CC versus TT and TC genotypes (beta = −0.25, p = 0.75, n = 756)).