Acknowledgements
The authors would like to thank EB Ehlerding for helpful proofreading.
Financial & competing interests disclosure
This work is supported, in part, by the University of Wisconsin–Madison, the NIH (NIBIB/NCI 1R01CA169365, P30CA014520), the Department of Defense (W81XWH-11-1-0644) and the American Cancer Society (125246-RSG-13-099-01-CCE). The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.
No writing assistance was utilized in the production of this manuscript.