[1] Univ Essen Gesamthsch Klinikum, Dept Cardiol, D-4300 Essen, Germany
[2] Univ Witten Herdecke, Inst Diagnost & Intervent, Mulheim, Germany
[3] Univ Witten Herdecke, Inst Diagnost & Intervent, Ruhr, Germany
[4] Univ Witten Herdecke, Dept Radiol & MicroTherapy, Bochum, Germany