Melegaro, A; Edmunds, WJ; (2004) The 23-valent pneumococcal polysaccharide vaccine. Part II. A cost-effectiveness analysis for invasive disease in the elderly in England and Wales. European journal of epidemiology, 19 (4). pp. 365-75. ISSN 0393-2990 https://researchonline.lshtm.ac.uk/id/eprint/6802 Full text not available from this repository.