Funding for this research was provided by:
North American Spine Society (2017)
Article History
Received: 19 November 2019
Accepted: 20 June 2020
First Online: 11 July 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.