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Contributors SSC and JBK, the cocorresponding authors, wrote and revised the manuscript before submission.
Funding This research was supported by the National Creative Research Initiative Programme (2011–0018312) and Basic Science Research Programme (NRF-2018R1A6A3A11043137) through the National Research Foundation of Korea funded by the Ministry of Education.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
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