Danovaro-Holliday M Carolina, Gordon Ely R, Woernle Charles, Higginbotham Gary H, Judy Randa H, Icenogle Joseph P, Reef Susan E
National Immunization Program, Centers for Disease Control and Prevention, Atlanta, Ga 30333, USA.
Am J Public Health. 2003 Feb;93(2):289-91. doi: 10.2105/ajph.93.2.289.