Article History
Received: 25 April 2018
Revised: 14 July 2018
Accepted: 23 August 2018
First Online: 31 August 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest. Dr. Giordan and Mr. Sorenson report no disclosures. Dr. Lanzino reports that he is a consultant of Medtronic.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: None. No human participants are involved in the study.