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Hunziker S, Johansson AC, Tschan F, Semmer NK, Rock L, Howell MD, Marsch S.Hunziker S, et al. Among authors: howell md.J Am Coll Cardiol. 2011 Jun 14;57(24):2381-8. doi: 10.1016/j.jacc.2011.03.017.J Am Coll Cardiol. 2011.PMID: 21658557Free article.Review.