K. Workowski, and S. Berman. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, (April 2007)PMID: 17342670.
K. Feldhoff, C. Groschopp, K. Blank, and B. Ziemer. Gesundheitswesen (Bundesverband Der Ärzte Des Öffentlichen Gesundheitsdienstes (Germany)), 63 (2):
61--65(February 2001)PMID: 11285749.
J. Garner. Infection Control and Hospital Epidemiology: The Official Journal of the Society of Hospital Epidemiologists of America, 17 (1):
53--80(January 1996)PMID: 8789689.