Received: 22 May 2019
Accepted: 1 June 2020
First Online: 1 July 2020
Ethics approval and consent to participate
: All animal experimental procedures were performed in compliance with the Institutional Animal Care and Use Committee guidelines at Seoul National University. Human samples were analyzed with Institutional permission under Review Board in Seoul National University Hospital. Control spinal cord samples were obtained from the Netherlands Brain Bank and the guidelines by The Netherlands Brain Bank were followed.
: Not applicable.
: The authors declare that they have no competing interests.