1. Centers for Disease Control and Prevention; National Center for Immunization and Respiratory Diseases; Division of Viral Diseases; Atlanta; GA; USA
2. Kid Risk, Inc., ; 10524 Moss Park Rd., Ste. 204-364; Orlando; FL; USA
3. Centers for Disease Control and Prevention; National Center for Immunization and Respiratory Diseases; Global Immunization Division; Atlanta; GA; USA