4) Cloninger CR: A systematic method for clinical description and classification of personality variants. A proposal. Archives of General Psychi-atry 1987; 44: 573-588.
5) Wills AT., Vaccaro D., McNamara G : Novelty seeking, risk taking, and related constructs as predictors of adolescent substance use: an appli-cation of Cloninger's theory. Journal of Substance Abuse 1994; 6 (1) : 1-20.