1. Immunization Safety Office, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. University Health Services, Princeton University, Princeton, New Jersey, USA
3. Student Health Service, University of California Santa Barbara, Santa Barbara, California, USA
4. Meningitis and Vaccine-Preventable Diseases Branch, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
5. Regulatory Affairs, Office of the Director, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA