Spinal cord stimulation for refractory angina in patients implanted with cardioverter defibrillators: five case reports. - Enggaard TP; Andersen C; Scherer C (Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology, 2010)