Acknowledgements
This work was supported by the National Cancer Institute under Grants R25 CA094061 (Dr. Leng), R01 CA166084 (Dr. Hershman), and R01 CA169121 (Dr. Wright).
Potential conflict of interest
Disclosure forms provided by the authors are available with the full text of this article online at https://doi.org/10.1080/10428194.2018.1429605.