About the Authors

Yoon Hong Choi

yoon.choi@hpa.org.uk

Affiliations Immunisation, Hepatitis and Blood Safety Department, Health Protection Agency, London, United Kingdom, Modelling and Economics Unit, Health Protection Agency, London, United Kingdom

Mark Jit

Affiliation Modelling and Economics Unit, Health Protection Agency, London, United Kingdom

Nigel Gay

Affiliation Fu Consulting, Hungerford, Berkshire, United Kingdom

Nick Andrews

Affiliation Statistics Unit, Health Protection Agency, London, United Kingdom

Pauline A. Waight

Affiliation Immunisation, Hepatitis and Blood Safety Department, Health Protection Agency, London, United Kingdom

Alessia Melegaro

Affiliation DONDENA Centre for Research on Social Dynamics, Bocconi University, Milan, Italy

Robert George

Affiliation Respiratory and Systemic Infection Laboratory, Health Protection Agency, London, United Kingdom

Elizabeth Miller

Affiliation Immunisation, Hepatitis and Blood Safety Department, Health Protection Agency, London, United Kingdom

Competing Interests

The authors have read the journal's policy and have the following conflicts: RG has declared that he has received funding from Wyeth (now Pfizer Vaccines) to support conference attendance which was not for the purpose of this study. RG, EM and NA have declared that they have been a member of the Department of Health's Joint Committee on Vaccines and Immunisations Committee Sub-committee on pneumococcal vaccines. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: YHC. Performed the experiments: YHC. Analyzed the data: YHC EM MJ NG NA PW AM RG. Wrote the paper: YHC EM MJ NG NA PW AM RG.