Comorbidities and factors associated with central nervous system infections and death in non-perinatal listeriosis: a clinical case series, Maertens de Noordhout, Charline, Devleesschauwer Brecht, Maertens De Noordhout A., Blocher J., Haagsma J A., Havelaar A. H., and Speybroeck Niko , BMC Infectious Diseases, Jan-12-2016, Volume 16, Issue 1, (2016)