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Spada E, Tosti ME, Zuccaro O, Stroffolini T, Mele A; Collaborating Study Group.Spada E, et al.J Infect. 2011 Feb;62(2):165-71. doi: 10.1016/j.jinf.2010.11.014. Epub 2010 Dec 1.J Infect. 2011.PMID: 21129400