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Shin-Bühring Y, Osang M, Ziegler R, Schaub J.Shin-Bühring Y, et al. Among authors: schaub j.Clin Chim Acta. 1976 Aug 2;70(3):371-7. doi: 10.1016/0009-8981(76)90349-1.Clin Chim Acta. 1976.PMID: 947629