On 2017 Nov 30, Joe G. Gitchell commented:
Readers may find the follow-up letter to this article (http://ajph.aphapublications.org/doi/full/10.2105/AJPH.2016.303456) and the authors' reply to the letter (http://ajph.aphapublications.org/doi/full/10.2105/AJPH.2016.303476) of interest.
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