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Bøtker HE, Sonne HS, Frøbert O, Andreasen F.Bøtker HE, et al.J Am Coll Cardiol. 1999 Mar 15;33(4):1056-61. doi: 10.1016/s0735-1097(98)00683-4.J Am Coll Cardiol. 1999.PMID: 10091836Free article.