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Principi N, Esposito S.Principi N, et al. Among authors: esposito s.Hum Vaccin Immunother. 2012 Jan;8(1):59-66. doi: 10.4161/hv.8.1.18011. Epub 2012 Jan 1.Hum Vaccin Immunother. 2012.PMID: 22252004Review.