Immuno & Safety Study of GSK Biologicals' Thio or Preservative Free Hepatitis B Vaccine in Subjects Aged 11-15 Yrs
Long-term Study of Immune Response Persistence of GSK Biologicals' 2-dose Thiomersal-free Engerix™-B and 3-dose Preservative-free Engerix™-B Vaccines in Subjects Aged 11-15 Yrs