| Authors: |
Boyce T; Independent consultant, Cardiff, United Kingdom., Gudorf A; Independent consultant, Copenhagen, Denmark., de Kat C; Vaccine-preventable Diseases and Immunization programme, World Health Organization Regional Office for Europe, Copenhagen, Denmark., Muscat M; Vaccine-preventable Diseases and Immunization programme, World Health Organization Regional Office for Europe, Copenhagen, Denmark., Butler R; Vaccine-preventable Diseases and Immunization programme, World Health Organization Regional Office for Europe, Copenhagen, Denmark., Habersaat KB; Vaccine-preventable Diseases and Immunization programme, World Health Organization Regional Office for Europe, Copenhagen, Denmark. |