M. Dworkin, L. Park, and S. Borchardt. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 44 (6):
810--6(March 2007)PMID: 17304452.
WHO. Relevé Épidémiologique Hebdomadaire / Section D'hygiène Du Secrétariat De La Société Des Nations = Weekly Epidemiological Record / Health Section of the Secretariat of the League of Nations, 83 (10):
90--91(March 2008)PMID: 18326110.
K. Kaier, C. Hagist, U. Frank, A. Conrad, and E. Meyer. Infection Control and Hospital Epidemiology: The Official Journal of the Society of Hospital Epidemiologists of America, 30 (4):
346--353(April 2009)PMID: 19236282.