1. Vaccines against tick-borne encephalitis: WHO position paper;Wkly Epidemiol Rec,2011
2. Grading of scientific evidence – Table I (vaccine efficacy and effectiveness). Available at: http://www.who.int/entity/immunization/TBE_grad_efficacy.pdf.
3. Grading of scientific evidence – Table II (vaccine safety). Available at: http://www.who.int/entity/immunization/TBE_grad_safety.pdf.
4. Grading of scientific evidence – Table III (induction of cross-protection). Available at: http://www.who.int/entity/immunization/TBE_grad_crossprotection.pdf.
5. Grading of scientific evidence – Tables IVa and IVb (duration of protection after primary immunization only and after primary immunizations plus one booster dose). Available at: http://www.who.int/entity/immunization/TBE_duration_protection.pdf.