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.
K. Anstey, H. Mack, and N. Cherbuin. The American Journal of Geriatric Psychiatry: Official Journal of the American Association for Geriatric Psychiatry, 17 (7):
542--555(July 2009)PMID: 19546653.
S. Huang, and R. Platt. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 36 (3):
281--285(February 2003)PMID: 12539068.