Funding for this research was provided by:
National Research Foundation of Korea (NRF-2015M3C7A1031969, 2017-0-00432)
Text and Data Mining valid from 2018-03-23
Received: 16 August 2017
Accepted: 5 March 2018
First Online: 23 March 2018
Ethics approval and consent to participate
: All participants provided informed consent and were reimbursed for their participation on completion of the experiment. The study was reviewed and approved by the Institutional Review Board (IRB) committee of Hanyang University.
: All subjects signed an informed consent to publish their data and images.
: The authors declare no competing financial interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.