Funding for this research was provided by:
National Cancer Institute (P30CA134274)
Text and Data Mining valid from 2018-06-20
Received: 2 February 2018
Accepted: 10 May 2018
First Online: 20 June 2018
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.