Improvement in quality of life and angina pectoris: 1-year follow-up of patients with refractory angina pectoris and spinal cord stimulation. - Vervaat FE; van der Gaag A; van Suijlekom H; Botman CJ; Teeuwen K; Wijnbergen I (Netherlands heart journal : monthly journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation, 2020)