Funding for this research was provided by:
National Cancer Center (NCC 1410140-2)
Received: 10 February 2017
Accepted: 4 December 2017
First Online: 12 January 2018
Ethics approval and consent to participate
: The NCC Institutional Review Board (IRB) approved the study (NCC 2015–0084). Approval for the review of hospital records was obtained from the NCC IRB and the need for patients’ informed consent was waived given the retrospective nature of the study.
: 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.