C. Geffers, D. Sohr, and P. Gastmeier. Infection Control and Hospital Epidemiology: The Official Journal of the Society of Hospital Epidemiologists of America, 29 (12):
1167--1170(December 2008)PMID: 19014317.
K. Anstey, H. Mack, and N. Cherbuin. The American Journal of Geriatric Psychiatry: Official Journal of the American Association for Geriatric Psychiatry, 17 (7):
542--555(July 2009)PMID: 19546653.