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Maximum phonation time: variability and reliability.
Speyer R, Bogaardt HC, Passos VL, Roodenburg NP, Zumach A, Heijnen MA, Baijens LW, Fleskens SJ, Brunings JW. Speyer R, et al. Among authors: heijnen ma. J Voice. 2010 May;24(3):281-4. doi: 10.1016/j.jvoice.2008.10.004. Epub 2008 Dec 25. J Voice. 2010. PMID: 19111437
[Splenectomy and pneumococcal vaccination].
Postma MJ, Heijnen MA, de Vries R, Beutels P, Jager JC. Postma MJ, et al. Among authors: heijnen ma. Ned Tijdschr Geneeskd. 2003 Jun 7;147(23):1141-2; author reply 1142. Ned Tijdschr Geneeskd. 2003. PMID: 12822527 Dutch. No abstract available.