Journal Article
O'Brien, Katherine L, Laura J Wolfson, James P Watt, Emilie Henkle, Maria Deloria-Knoll, Natalie McCall, Ellen Lee, Kim Mulholland, Orin S Levine, and Thomas Cherian.
"Burden of disease caused by Streptococcus pneumoniae in children younger than 5 years: global estimates." The Lancet 374, no. 9693 (2009): 893-902.