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Helleberg M, Kronborg G, Ullum H, Ryder LP, Obel N, Gerstoft J.Helleberg M, et al. Among authors: ryder lp.J Infect Dis. 2015 Jun 1;211(11):1726-34. doi: 10.1093/infdis/jiu669. Epub 2014 Dec 8.J Infect Dis. 2015.PMID: 25489001