Article Title,Year,Volume,Issue,Page Range,Author Neurogenetics and epigenetics in impulsive behaviour: impact on reward circuitry,2012,3,3,1000115,Archer Neuropsychiatric genetics of happiness friendships and politics: hypothesizing homophily ("birds of a feather flock together") as a function of reward gene polymorphisms,2012,3,112,ePub,Blum