Funding for this research was provided by:
National Institute of Neurological Disorders and Stroke (1ZIANS003151)
Received: 25 September 2019
Accepted: 4 February 2020
First Online: 13 February 2020
Ethics approval and consent to participate
: This research was conducted as a retrospective analysis of de-identified registry data, for which we obtained a determination of <i>Not Human Subjects Research</i> from the NIH Office of Human Subjects Research Protections (OHSRP). Thus consent and IRB approval were not required.
: See above; consent for publication was not required.
: The authors declare that they have no competing interests.