Text and Data Mining valid from 2018-12-01
Received: 9 August 2018
Accepted: 29 October 2018
First Online: 22 December 2018
Ethics approval and consent to participate
: The present study protocol was reviewed and approved by the institutional review board of Hanyang University Seoul Hospital (no. 2017-05-028-001).
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: The authors declare that they have no competing interests.
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