title: Commentary.
authors.affiliation: Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway; ingar.olsen@odont.uio.no.
authors.forename: Ingar
authors.initials: I
authors.lastname: Olsen
references.citation: Neuroreport. 1993 Jul;4(7):841-8
references.pmid: 8369471
references.citation: J Am Dent Assoc. 2007 Oct;138(10):1314-22; quiz 1381-2
references.pmid: 17908844
references.citation: Alzheimers Dement. 2006 Apr;2(2):110-7
references.pmid: 19595867
references.citation: Oral Microbiol Immunol. 2002 Apr;17(2):113-8
references.pmid: 11929559
references.citation: J Neuroinflammation. 2011 Aug 04;8:90
references.pmid: 21816039