Copyright © 2015 Specht et al.  This is an open-access article distributed under the terms of the <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/">Creative Commons Attribution-Noncommercial-ShareAlike 3.0 Unported license</a>, which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original author and source are credited.
Except where otherwise noted, this item's license is described as Copyright © 2015 Specht et al. This is an open-access article distributed under the terms of the <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/">Creative Commons Attribution-Noncommercial-ShareAlike 3.0 Unported license</a>, which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original author and source are credited.