Funding for this research was provided by:
National Research Foundation of Korea (2016R1D1A1B03934564)
Korea Breast Cancer Foundation (KBCF-2015E002)
Received: 14 February 2017
Accepted: 19 December 2017
First Online: 16 January 2018
Ethics approval and consent to participate
: The prospective study was approved by institutional review board at Severance Hospital, Seoul, Korea (IRB approval number 4–2015-0819). We obtained informed consent in writing from all patients who participated in this study.
: Not applicable.
: The authors declare no competing interest.
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