“Non-Cognitive Skills for Safe Sexual Behavior: An Exploration of Baseline Abstinence Skills, Condom Use Negotiation, Self-Esteem, and Assertiveness Skills from a Controlled Problem-Based Learning Intervention Among Adolescents in Tanzania”. Global Journal of Medical Research, vol. 20, no. K10, Aug. 2020, pp. 43-59, https://medicalresearchjournal.org/index.php/GJMR/article/view/2215.