M. Dworkin, L. Park, und S. Borchardt. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 44 (6):
810--6(März 2007)PMID: 17304452.
R. Tsang, M. Sill, S. Skinner, D. Law, J. Zhou, und J. Wylie. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 44 (12):
1611--4(Juni 2007)PMID: 17516405.