E.-K.C. declares research grants or speaking fees from Abbott, Bayer, Biosense Webster, BMS/Pfizer, Chong Kun Dang, Daewoong Pharmaceutical, Daiichi Sankyo, DeepQure, Dreamtech, Jeil Pharmaceutical, Medtronic, Samjinpharm, Samsung Electronics, Seers Technology and Skylabs. K.I. declares honoraria from Boston Scientific, Daiichi Sankyo, Johnson & Johnson and Medtronic. P.S. declares that the University of Adelaide, Australia, has received on his behalf research grants from Abbott, Boston Scientific, Becton Dickinson and Medtronic, and reports serving on advisory boards for Abbott, Boston Scientific, CathRx, Medtronic and Pacemate. The other authors declare no competing interests.