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Kaufman P (1941). Studies on old age pneumonia. II. Prophylactic effect of pneumococcus polysaccharide against pneumonia. Archives of Internal Medicine 61:304-319.

Kaufman P. Studies on old age pneumonia. II. Prophylactic effect of pneumococcus polysaccharide against pneumonia. Archives of Internal Medicine 1941;61:304-319.

Kaufman P. Studies on old age pneumonia. II. Prophylactic effect of pneumococcus polysaccharide against pneumonia. Archives of Internal Medicine 1941;61:304-319.

Context