B. Orden, R. Martínez, R. Millán, M. Belloso, und N. Pérez. Clinical Microbiology and Infection: The Official Publication of the European Society of Clinical Microbiology and Infectious Diseases, 9 (12):
1245--1247(Dezember 2003)PMID: 14686993.
J. Winstead, D. McKinsey, S. Tasker, M. Groote, und L. Baddour. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 30 (1):
87--94(Januar 2000)PMID: 10619738.
J. Bigham, M. Hutcheon, D. Patrick, und A. Pollard. Canada Communicable Disease Report = Relevé Des Maladies Transmissibles Au Canada, 27 (2):
13--8(Januar 2001)PMID: 11227821.