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TO THE EDITOR:

Kang, Chang-Nam PhD; Heo, Dong Ryul MD; Choi, Sung Hoon MD

doi: 10.1097/BRS.0000000000003211
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spineshchoi@gmail.com

Received 7 June, 2019

Accepted 13 August, 2019

The manuscript submitted does not contain information about medical device(s)/drug(s).

No funds were received in support of this work.

No relevant financial activities outside the submitted work.

Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.