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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: koopman bj.Clin Chim Acta. 1989 May 31;181(3):273-9. doi: 10.1016/0009-8981(89)90233-7.Clin Chim Acta. 1989.PMID: 2758681
Wolthers BG, Volmer M, van der Molen J, Koopman BJ, de Jager AE, Waterreus RJ.Wolthers BG, et al. Among authors: koopman bj.Clin Chim Acta. 1983 Jun 30;131(1-2):53-65. doi: 10.1016/0009-8981(83)90352-2.Clin Chim Acta. 1983.PMID: 6883710