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title = {{Cost effectiveness/utility analyses}},  journal = {Journal of Health Economics},  }  @article{Gafni_2006,  doi = {10.1016/j.socscimed.2005.10.023},  url = {http://dx.doi.org/10.1016/j.socscimed.2005.10.023},  year = {2006},  month = {may},  publisher = {Elsevier {BV}},  volume = {62},  number = {9},  pages = {2091--2100},  author = {Amiram Gafni and Stephen Birch},  title = {{Incremental cost-effectiveness ratios ({ICERs}): The silence of the lambda}},  journal = {Social Science {\&} Medicine},  }