E. Becoña and M. d. P. García, “Evaluation of the amount of therapist contact in a smoking cessation program”., Span. j. psychol., vol. 3, p. 28, Jan. 2000, Accessed: Feb. 16, 2025. Available: https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0000110028A