1. Vaccine Research Center, University of Tampere, Tampere, Finland
2. Hospital Maternidad Nuestra Señora de la Altagracia Santo Domingo, Santo Domingo, Dominican Republic
3. University of Tampere, Tampere Vaccine Research Clinic, Tampere, Finland
4. Vaccine Research Center, University of Tampere, Järvenpää Vaccine Clinic, Järvenpää, Finland
5. GSK, Wavre, Belgium
6. Chiltern International c/o GSK, Wavre, Belgium