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A
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government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Data are hazard ratios (HRs) and 95% CIs. Abbreviations: SE, standard error; IV, inverse variance methods; CI, confidence interval, df, degree of freedom.
