J. Top, N. Banga, R. Hayes, R. Willems, M. Bonten, und 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.
A. Forsgren, K. Riesbeck, und H. Janson. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 46 (5):
726--731(März 2008)PMID: 18230042.