Funding for this research was provided by:
Korea University (K1912981)
Received: 17 September 2019
Accepted: 3 December 2019
First Online: 1 January 2020
Ethics approval and consent to participate
: This study complied with the Declaration of Helsinki and was approved by the institutional review board of our institute (IRB No.: 2017AN0178). Informed consent was obtained from all individual participants included in the study.
: Each author certifies that he or she has participated in the preparation of this article and agrees with the content of the manuscript. Each author represents that this article is original, that it is not under consideration by another journal, and that it has not been previously published. All undersigned authors transfer, assign, and otherwise convey all copyright ownership to <i>Knee Surgery & Related Research</i>, and represent that they own all rights in the material submitted. This assignment is to take effect only if the work is published in the journal (<i>Knee Surgery & Related Research</i>).
: The authors declare that they have no competing interests regarding this article.