Traykov Vassil B, Kotirkov Kostadin I, Petrov Ivo S
Department of Invasive Electrophysiology and Pacing, Clinic of Cardiology and Angiology, Tokuda Hospital, Sofia, Bulgaria.
Heart. 2013 Apr;99(7):509. doi: 10.1136/heartjnl-2012-303311. Epub 2013 Jan 12.