S. Shehab, N. Keller, A. Barkay, L. Leitner, A. Leventhal, and C. Block. European Journal of Clinical Microbiology & Infectious Diseases: Official Publication of the European Society of Clinical Microbiology, 17 (11):
749--53(November 1998)PMID: 9923513.
D. Raphael. Health Promotion Journal of Australia: Official Journal of Australian Association of Health Promotion Professionals, 17 (3):
167--170(December 2006)PMID: 17176228.
J. Top, N. Banga, R. Hayes, R. Willems, M. Bonten, and M. Hayden. Clinical Microbiology and Infection: The Official Publication of the European Society of Clinical Microbiology and Infectious Diseases, 14 (4):
363--369(April 2008)PMID: 18261124.