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Claessen MM, Vleggaar FP, Tytgat KM, Siersema PD, van Buuren HR.Claessen MM, et al. Among authors: vleggaar fp.J Hepatol. 2009 Jan;50(1):158-64. doi: 10.1016/j.jhep.2008.08.013. Epub 2008 Oct 14.J Hepatol. 2009.PMID: 19012991