Received: 23 April 2020
Accepted: 20 July 2020
First Online: 29 July 2020
Ethics approval and consent to participate
: Our Ethics Review Board (National Healthcare Group Domain-Specific Review Board) approved the study (approval number DSRB B/2013/00132). As the study is a retrospective observational one, the need for patient consent was waived.
: Not applicable.
: KCS has received honoraria and travel support from Medtronic. JS and JT have no conflicts of interest to declare.