GRIN2A and Parkinson disease: The a-priori hypothesis for replication that among heavy drinkers GRIN2A_rs4998386_T carriers had a lower risk of PD than GRIN2A_rs4998386_CC was replicated comparing TC to CC (excluding rare heterogeneous TT genotype): OR = 0.59, P = 10−3; under Additive model (TT vs. TC vs. CC): OR = 0.77, P = 0.04; and Dominant model (TT+TC vs. CC): OR = 0.70, P = 0.01.