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.
K. Kaier, C. Hagist, U. Frank, A. Conrad, and E. Meyer. Infection Control and Hospital Epidemiology: The Official Journal of the Society of Hospital Epidemiologists of America, 30 (4):
346--353(April 2009)PMID: 19236282.