Statistics from Altmetric.com
Funding AB and LBF were supported by funding of the Intramural Program of the National Cancer Institute, National Institutes of Health. BR was supported by NIH funding from grant# ES10544 and P01ES016732.
Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.