Funding for this research was provided by:
National Institutes of Health (P30CA008748)
Received: 11 July 2017
Accepted: 27 December 2017
First Online: 6 January 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of Memorial Sloan Kettering Cancer Center, New York, NY, USA. For this type (retrospective) of study formal consent is not required.
: Not applicable.
: The authors declare that they have no competing interests.
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