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Authors
Park, Ki Deok
Lee, Woo Yong
Nam, Sang Hyun
Kim, Myounghwan
Park, Yongbum https://orcid.org/0000-0002-8288-9450
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Article History
Received: 10 September 2018
Accepted: 30 November 2018
First Online: 5 December 2018
Compliance with ethical standards
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: The authors have no conflict of interest for this study.
: Procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: This study was a retrospective comparative review of chart data. Patient privacy and data confidentiality were maintained throughout the research process. The institutional review board of the corresponding author’s affiliated university approved the study. The approval included a waiver of informed consent, because the study did not include direct contact with the study population, and all patient identifiers were removed from the data set on the initial collection.
