Objectives. Cost studies can provide useful guidance, so long as they adhere to accepted methodology. Cochlear implants (CIs)\nare electronic devices introduced surgically into the inner ear. It is a relevant example to review cost study analyses because of its\ncostliness. The aim of this study was to review relevant published cost studies of CI to analyze the method used. Methods. First,\nwe described the key points of cost study methodology. Cost studies relating to CI were systematically reviewed, focussing on\nan analysis of the different methods used. Results. The methods, data sources, and estimated cost categories in each study varied\nwidely. The paper showed that cost studies adopted significantly different approaches to estimate costs of CI, reflecting a lack of\nconsensus on the methodology of cost studies. Conclusion. To increase its credibility, closer agreement among researchers on the\nmethodological principles of cost studies would be desirable.
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