Article History
Received: 28 May 2020
Revised: 19 August 2020
Accepted: 3 September 2020
First Online: 22 September 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: We certify that all applicable institutional and governmental regulations concerning the ethical use of human volunteers were followed during the course of this research. Research ethics board approval was obtained from each institution participating in the NACTN SCI registry, STASCIS, and NASCIS III trials, whose data were used for our study.