1. Pneumococcal vaccines WHO position paper—2012;Wkly Epidemiol Rec,2012
2. Pneumococcal conjugate vaccine for childhood immunization—WHO position paper;Wkly Epidemiol Rec,2007
3. 23-Valent pneumococcal polysaccharide vaccine WHO position paper;Wkly Epidemiol Rec,2008
4. Grading of scientific evidence—table I (evidence of protection). Available at: http://www.who.int/entity/immunization/pneumococcal_grad_carriage.pdf.
5. Grading of scientific evidence—table II (evidence of safety). Available at: http://www.who.int/entity/immunization/pneumococcal_grad_carriage.pdf.