Letter in response to commentary by Small and Cronin.

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@article{Grohskopf2017LetterIR, title={Letter in response to commentary by Small and Cronin.}, author={Lisa A. Grohskopf and Ivo M. Foppa and Brendan L Flannery and Alicia M . Fry}, journal={Vaccine}, year={2017}, volume={35 39}, pages={5225} }