Funding for this research was provided by:
Pfizer (n/a)
Article History
Received: 27 December 2017
Accepted: 11 April 2018
First Online: 16 April 2018
Ethics approval and consent to participate
: This study used commercially available de-identified secondary data sources and was considered exempt from the requirements for “human subjects’ research” in the United States as it does not contain 18 elements of private health information (PHI).(HIPAA Privacy Rule: ExternalRef removed).
: The study was funded by Pfizer, Inc. Pfizer markets a pneumococcal vaccine in the United States. JH, RC, and RS are employees and stock holders of Pfizer, Inc. JB received an unrelated educational grant from Pfizer, Inc. during 2014–16.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.