Harper, Martin
Weis, Christopher
Pleil, Joachim D
Blount, Benjamin C
Miller, Aubrey
Hoover, Mark D
Jahn, Steven
Article History
Received: 30 April 2014
Revised: 31 October 2014
Accepted: 1 November 2014
First Online: 11 February 2015
Competing interests
: The findings and conclusions in this report are those of the author(s) and do not necessarily represent the official position of the Centers for Disease Control and Prevention/the Agency for Toxic Substances and Disease Registry. This work was reviewed by the U.S. EPA and approved for publication.