1. Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Mailstop A-34, Atlanta, GA 30333, USA
2. Division of Hospital Medicine, Emory University School of Medicine, 101 Woodruff Cir, Atlanta, GA 30322, USA
3. Department of Pediatrics, Baylor College of Medicine, 6701 Fannin St., Houston, TX 77030, USA
4. Kirby Marketing Solutions, 3808 Villas Del Sol Ct, Tampa, FL 33609, USA