1 23 PharmacoEconomics ISSN 1170-7690 PharmacoEconomics DOI 10.1007/s40273-013-0108-8 Cost Effectiveness of Medication Adherence-Enhancing Interventions: A Systematic Review of Trial-Based Economic Evaluations Edwin J. M. Oberjé, Reina J. A. de Kinderen, Silvia M. A. A. Evers, Cees M. J. van Woerkum & Marijn de Bruin