PREAMBLE:THE membership of the Society of In-terventional Radiology (SIR) Standards of Practice Committee represents experts in a broad spectrum of interven-tional procedures from both the private and academic sectors of medicine. Generally Standards of Practice Committee members dedicate the vast majority of their professional time to performing in-terventional procedures; as such they represent a valid'broad expert constituency of the subject matter under consideration for standards production.Technical documents specifying the exact consensus and literature review methodologies as well as the institutional affiliations and professional credentials of the authors of this document are available upon request from SIR, 3975 Fair Ridge Dr, Ste 400 North, Fairfax, VA 22033.
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