Abstract

This research was sponsored by Pfizer.

J Campling, D Jones, G Ellsbury, C Czudek, and H Madhava are employees of Pfizer and have no conflicts of interest to declare.

M Slack has received personal fees from GSK, Pfizer, AstraZeneca and Sanofi Pasteur as a speaker at international meetings and as a member of advisory boards (outside the scope of the submitted work). She has also worked as a contractor for Pfizer. HES analyses were done by Harvey Walsh Health Informatics, and medical writing support was provided by Richard Watt at Sudler, both of which were funded by Pfizer.