Funding for this research was provided by:
National R&D Program for Cancer Control, Ministry of Health & Welfare, Korea (1520160)
Text and Data Mining valid from 2018-09-24
Received: 12 December 2017
Accepted: 17 September 2018
First Online: 24 September 2018
Ethics approval and consent to participate
: This study has been approved by our institutional review board (Severance Hospital, Yonsei University College of Medicine; e-IRB: ExternalRef removed; IRB number: 4–2015-0029). Any modifications to the protocol will be implemented only after they are approved by the IRB and notified to all participating investigators and patients. We obtained informed written consent to participate in this study from all participating patients. The translated version of the model informed consent form is provided as an additional document (see Additional file InternalRef removed).
: Not applicable.
: The authors declare that they have no competing interests.
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