Conflict of interest
None of the authors have any actual or potential conflict of interest
including any financial, personal or other relationships with other people
or organizationswithin three years of beginning the submittedwork
that could inappropriately influence, or be perceived to influence, their
work.
Acknowledgments
This work was funded under sponsorship of the National Science
Foundation (NSF), awards #1009106 and #1004181 and the
National Institute for Environmental Health Sciences (NIEHS),
award #R21ES017413-01A2. Fleming received support from the
European Regional Development Fund and the European Social
Fund (European Centre for Environment and Human Health, University
of Exeter Medical School). Di Jin and Mary Schumacher provided
useful comments and suggestions on early drafts. Andy Beet
provided research assistance.