E. Bouza, A. Burillo, and P. Muñoz. Clinical Microbiology and Infection: The Official Publication of the European Society of Clinical Microbiology and Infectious Diseases, 8 (5):
265--274(May 2002)PMID: 12047403.
R. Tsang, M. Sill, S. Skinner, D. Law, J. Zhou, and J. Wylie. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 44 (12):
1611--4(June 2007)PMID: 17516405.