Funding for this research was provided by:
Text and Data Mining valid from 2019-04-11
Received: 3 September 2018
Accepted: 6 December 2018
First Online: 11 April 2019
Compliance with ethical standards
: Cesar A. Santa-Maria has received Research Grants from Medimmune, Pfizer, and Tesaro as well as served on an Advisory Board for Polyphor and Genomic Health. The rest of the authors declare that they have no conflict of interest.
: Chart reviewing of existing electronic health records belonging to our human participants was in accordance with the Ethical Standards of the Institutional and/or National Research Committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Institutional Research Committee waived the requirement for obtaining informed consents from study participants as it is a retrospective study using existing but de-identified health records.