Reward deficiency syndrome: a biogenetic model for the diagnosis and treatment of impulsive, addictive, and compulsive behaviors. - Blum,K.; Braverman,E.R.; Holder,J.M.; Lubar,J.F.; Monastra,V.J.; Miller,D.; Lubar,J.O.; Chen,T.J.; Comings,D.E. (J Psychoactive Drugs, 2000)