A. Forsgren, K. Riesbeck, and H. Janson. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 46 (5):
726--731(March 2008)PMID: 18230042.
M. Breukels, E. van der Zijde, M. van Tol, and G. Rijkers. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 34 (2):
191--7(January 2002)PMID: 11740707.