The study was sponsored by AstraZeneca, which
collaborated in the execution of the trial and
collected the data. All authors had full access to
the data and the data analysis. The analyses were
performed by AstraZeneca under the direction of
the executive committee. The executive committee
made the decision to submit the manuscript
for publication. The authors vouch for the accuracy
and completeness of the data and data analyses
and the fidelity of this report to the study
protocol. The first author wrote the first draft of
the manuscript, which was edited by all the other
authors.