Aorta/surgery; Blood Vessel Prosthesis Implantation/instrumentation; Blood Vessel Prosthesis; Device Approval; Endovascular Procedures/instrumentation; Stents; United States Food and Drug Administration; Blood Vessel Prosthesis/standards; Blood Vessel Prosthesis Implantation/adverse effects; Blood Vessel Prosthesis Implantation/legislation & jurisprudence; Blood Vessel Prosthesis Implantation/standards; Compassionate Use Trials; Device Approval/legislation & jurisprudence; Device Approval/standards; Diffusion of Innovation; Endovascular Procedures/adverse effects; Endovascular Procedures/legislation & jurisprudence; Endovascular Procedures/standards; Evidence-Based Medicine; Humans; Patient Safety; Practice Guidelines as Topic; Prosthesis Design; Risk Assessment; Risk Factors; Societies, Medical; Stents/standards; Treatment Outcome; United States; United States Food and Drug Administration/legislation & jurisprudence; United States Food and Drug Administration/standards