Conflicts of Interest The authors declare no conflicts of interest. References 1965. “ Inequity in Social Exchange.” In Advances in Experimental Social Psychology, edited by L. Berkowitz, vol. 2, 267299. Academic Press. 1991. “The Theory of Planned Behavior.” Organizational Behavior and Human Decision Processes 50, no. 2: 179–211. 2002. “Perceived Behavioral Control, Self-Efficacy, Locus of Control, and the Theory of Planned Behavior.” Journal of Applied Social Psychology 32, no. 4: 665–683. , and . 1990.