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Authors
Chol-Man Pak,
Han, Un-Chol
Kang, Hye-Jong
Ri, Chang-Bong
Jo, Yong-Nyo
Kim, Jin-Song
Ri, Kwang-Il
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Article History
Received: 1 June 2020
Revised: 15 December 2020
Accepted: 18 December 2020
First Online: 11 January 2022
CONFLICT OF INTERESTS
: Authors announce that there is no conflict of interest.
