https://eurointervention.pcronline.com/article/percutaneous-intervention-in-chronic-total-coronary-occlusions-caused-by-in-stent-restenosis-procedural-results-and-long-term-clinical-outcomes-in-the-toro-spanish-registry-of-chronic-total-occlusion-secondary-to-an-occlusive-in-stent-restenosis-multicentre-registry