Article History
First Online: 19 January 2019
Compliance with Ethical Standards
:
: Samuel Cottam has no conflict of interest to declare. Daniel Cottam, the corresponding author, reports personal fees from Medtronic, outside the submitted work. Austin Cottam has no conflict of interest to declare.
: This study did not involve performing any procedures. Thus, it was done in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.Since this is a retrospective study, the formal consent is not required for this type of study.