Funding for this research was provided by:
National Science Foundation (GRFP 1106401)
Article History
Received: 11 March 2015
Revised: 18 July 2015
Accepted: 10 August 2015
First Online: 19 August 2015
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted. All procedures were approved by Duke University’s Institutional Animal Care and Use Committee.