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.
C. Walker, and H. Wiesenfeld. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, (April 2007)PMID: 17342664.
K. Hansen, and D. Singer. Pediatric and Developmental Pathology: The Official Journal of the Society for Pediatric Pathology and the Paediatric Pathology Society, 4 (2):
105--121(April 2001)PMID: 11178626.