SLC22A1 and drug-induced dyskinesia: Finally, heterozygotes for SLC22A1 rs628031 and carriers of at least one SLC22A1 rs628031 A allele had lower odds for dyskinesia (OR = 0.48; 95% CI = 0.24–0.98, p = 0.043 and OR = 0.48; 95% CI = 0.25–0.92; p = 0.027, respectively).