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pubmed.ncbi.nlm.nih.gov
José, Ricardo J.; Brown, Jeremy S. (2017). »Adult pneumococcal vaccination«. Current Opinion in Pulmonary Medicine. 23 (3): 225–230. doi:10.1097/MCP.0000000000000369. PMID28198725.
Woodhead MA, Macfarlane JT, McCracken JS, Rose DH, Finch RG (Marec 1987). »Prospective study of the aetiology and outcome of pneumonia in the community«. Lancet. 1 (8534): 671–4. doi:10.1016/S0140-6736(87)90430-2. PMID2882091.