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Topic selection. The present document is an Expert Consensus. The type of document is intended to inform practitioners, payers and other interested parties of the opinion of the American College of Cardiology (ACC) concerning evolving areas of clinical practice or technologies, or both, that are widely available or are new to the practice community. Topics chosen for coverage by Expert Consensus documents are so designated because the evidence base and experience with the technology or clinical practice are not sufficiently well developed to be evaluated by the forma1 ACC/American Heart Association (AI-IA) Practice Guidelines process. Thus, the reader should view the Expert Consensus documents as the best attempt of the ACC to inform and guide ciinical practice in areas where rigorous evidence is not yet available. Where feasible, tipert Consensus documents will include indications and …