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Article History
Received: 23 April 2019
Accepted: 24 August 2019
First Online: 30 August 2019
Compliance with ethical standards
: This study was approved by the Institutional Review Board of Kyungpook National University Chilgok Hospital and Ulsan University Hospital.
: The authors declare that they have no competing interests.
Free to read: This content has been made available to all.
