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Eckhardt KU, Frei U, Kliem V, Bauer C, Koch KM, Kurtz A.Eckhardt KU, et al.Eur J Clin Invest. 1990 Oct;20(5):563-72. doi: 10.1111/j.1365-2362.1990.tb01902.x.Eur J Clin Invest. 1990.PMID: 2124989
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