R. Ingram, B. Cornere, and R. Ellis-Pegler. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 15 (2):
321--324(August 1992)PMID: 1520766.
C. Peña, M. Dominguez, M. Pujol, R. Verdaguer, F. Gudiol, and J. Ariza. Clinical Microbiology and Infection: The Official Publication of the European Society of Clinical Microbiology and Infectious Diseases, 9 (9):
938--43(September 2003)PMID: 14616682.
P. Gastmeier, D. Sohr, C. Geffers, M. Behnke, and H. Rüden. Infection Control and Hospital Epidemiology: The Official Journal of the Society of Hospital Epidemiologists of America, 28 (4):
466--72(April 2007)PMID: 17385154.