Response by Rillig et al to Letter Regarding Article, "An Unexpectedly High Incidence of Stroke and Left Atrial Appendage Thrombus Formation After Electrical Isolation of the Left Atrial Appendage for the Treatment of Atrial Tachyarrhythmias". (September 2016) - Rillig, Andreas; Tilz, Roland R.; Lin, Tina; Fink, Thomas; Heeger, Christian-H.; Arya, Anita; Metzner, Andreas; Mathew, Shibu; Wissner, Erik; Makimoto, Hisaki; Wohlmuth, Peter; Kuck, Karl-Heinz; et al.