SLC22A1 and impulse control disorder: Carriers of the SLC22A1 rs628031 AA genotype had higher odds for peripheral edema and impulse control disorders (OR = 4.00; 95% CI = 1.62–9.88; p = 0.003 and OR = 3.16; 95% CI = 1.03–9.72; p = 0.045, respectively).