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Publisher's Note: Typographical Error in the Text

Posted by PLOS_ONE_Group on 09 Aug 2013 at 20:35 GMT

The first sentence of the fourth paragraph in the introduction contains the following incorrect statement:
"Recent legislation in California banning the use of non-lead rifle ammunition...".
The correct text is:
"Recent legislation in California banning the use of lead rifle ammunition...".

No competing interests declared.