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van Doormaal JJ, Smit N, Koopman BJ, van der Molen JC, Wolthers BG, Doorenbos H.van Doormaal JJ, et al. Among authors: wolthers bg.Clin Chim Acta. 1989 May 31;181(3):273-9. doi: 10.1016/0009-8981(89)90233-7.Clin Chim Acta. 1989.PMID: 2758681