Text and Data Mining valid from 2019-04-01
Received: 9 August 2018
Accepted: 20 March 2019
First Online: 1 April 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board of the Gangnam Severance Hospital (Protocol number: 3–2018-0196). Because we used the CT images of patients who already had finished their treatment in our institution, patient informed consent was not required for this study.
: Not applicable.
: The authors declare that they have no competing interests.
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