R. Bonomo, and D. Szabo. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, (September 2006)PMID: 16894515.
R. Ingram, B. Cornere, and R. Ellis-Pegler. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 15 (2):
321--324(August 1992)PMID: 1520766.