P. Wals, G. Deceuninck, {. Boucher, and M. Ouakki. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 46 (8):
e75--77(April 2008)PMID: 18444843.
R. Tsang, M. Sill, S. Skinner, D. Law, J. Zhou, and J. Wylie. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 44 (12):
1611--4(June 2007)PMID: 17516405.