Macartney K K, Offit P A
Section of Infectious Diseases, Division of Immunologic and Infectious Diseases, Children's Hospital of Philadelphia, 34th St. and Civic Center Blvd., Philadelphia, PA 19104, USA.
Pediatr Ann. 2001 Jul;30(7):392-9. doi: 10.3928/0090-4481-20010701-06.