1. Departments of Pediatrics, Medicine and Cellular and Molecular Medicine, Glycobiology Research and Training Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093-0687, U.S.A.
2. National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-7510, U.S.A.
3. Division of Infectious Disease, Children's Hospital and Regional Medical Center and Department of Pediatrics, University of Washington, Seattle, Washington
4. Department of Molecular Microbiology and the Center for Women's Infectious Diseases Research, Washington University School of Medicine, St. Louis, MI 63110, U.S.A.