M. Bonten, D. Austin, and M. Lipsitch. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 33 (10):
1739--46(November 2001)PMID: 11595995.
C. Capitini, I. Herrero, R. Patel, M. Ishitani, and T. Boyce. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 34 (12):
E74--76(June 2002)PMID: 12032914.