1. Noguchi Memorial Institute for Medical Research, University of Ghana, Legon
2. Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
3. Department of Pediatrics, Perinatal Institute, Ohio
4. Division of Infectious Diseases, Cincinnati Children’s Hospital Medical Center, Ohio
5. PPD, San Diego, California, USA
6. Navrongo Health Research Centre, Ministry of Health, Ghana