Isturiz RE, Ramirez J, Self WH, Grijalva CG, Counselman FL, Volturo G, Ostrosky-Zeichner L, Peyrani P, Wunderink RG, Sherwin R, Overcash JS, Oliva SP, File T, Wiemken TL, McLaughlin JM, Pride MW, Gray S, Alexander R, Ford KD, Jiang Q, Jodar L. Pneumococcal epidemiology among us adults hospitalized for community-acquired pneumonia. Vaccine. 2019 05 31; 37(25):3352-3361.