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Reply to: “Use of immortal time within survival analysis”

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Funding sources: Supported by Stanford Medical Scholars Research Program (to Mr Lee). Stanford Cancer Institute Research Database (SCIRDB) is funded by a National Cancer Institute Cancer Center support grant (no. 5P30CA124435) and Stanford National Institutes of Health/National Center for Research Resources Clinical and Translational Science Award (no. UL1 RR025744).

Conflicts of interest: Dr Chang is a clinical investigator and advisory board member for Merck and Regeneron. All other authors do not have any conflicts of interested to disclose.

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