[1] Brandenburg Heart Ctr, Bernau, Germany
[2] Isala Clin, Zwolle, Netherlands
[3] Leiden Univ, Med Ctr, Leiden, Netherlands
[4] Cardiac Ctr Coburg, Coburg, Germany
[5] PraxisKlin Herz & Gefasse, Dresden, Germany
[6] EBR Syst Inc, San Francisco, CA 94143 USA
[7] Cardioctr Ticino, Lugano, Switzerland