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A systematic review (SR) can provide rigorous and complete evidence to support decision makers who consider both the effectiveness and cost-effectiveness of health interventions. A dramatic increase in published health economic (HE) studies, more specifically cost and cost-effectiveness studies, has resulted in the consequent proliferation of systematic reviews with cost and cost-effectiveness outcomes (SR-CCEO). 1, 2 First, such reviews help to indentify strenghts and weaknesses in HE studies, modelling methodologies, and data for modelling inputs. Second, SR-CCEOs may be informative for decisionmakers in resource allocation decisions for health interventions, especially in countries with limited capacity for health technology assessment (HTA). For the purpose of this article, cost studies are defined as studies analyzing the costs of healthcare interventions, including cost descriptions and cost-of-illness …