Conflicts of interest:
Dr. Di Biase is a consultant for Stereotaxis, Biosense Webster, Boston Scientific, Abbott; has received speaker honoraria/travel support from Medtronic, Atricure, Bristol Meyers Squibb, Pfizer and Biotronik. Dr. Natale is a consultant for Biosense Webster, Stereotaxis, Abbott; has received speaker honoraria/travel support from Medtronic, Atricure, Biotronik and Janssen. Remaining authors report no conflict of interest.