Article History
Received: 14 April 2018
Accepted: 11 October 2018
First Online: 17 October 2018
Compliance with ethical standards
:
: Ms. Zhang is employed by Medtronic, who provided access to the data source for the analysis. No products or services from Medtronic were relevant to this work, and there was no payment for the work. Deborah S. Keller and Manish Chand have no conflicts of interest or financial ties to disclose.