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Becker RC, Spencer FA, Li Y, Ball SP, Ma Y, Hurley T, Hebert J.Becker RC, et al. Among authors: ball sp.J Am Coll Cardiol. 1999 Oct;34(4):1020-7. doi: 10.1016/s0735-1097(99)00322-8.J Am Coll Cardiol. 1999.PMID: 10520784Free article.Clinical Trial.