title: Narrow complex tachycardia with alternating R-R intervals during physical stress: double ventricular excitation.
authors: Department of cardiology, University of Tuebingen, Germany. roman.laszlo@med.uni-tuebingen.de
authors: Roman
authors: R
authors: Laszlo
authors: Hans-Joerg
authors: HJ
authors: Weig
authors: Slawomir
authors: S
authors: Weretka
authors: Juergen
authors: J
authors: Schreieck