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Leveraging large-scale electronic health record (EHR) data to estimate survival curves for clinical events can enable more powerful risk estimation and comparative effectiveness research. ... Occurrence times of relevant diagnostic codes or target disease mentions in clinical notes are at best a good approximation of the true disease onset time. ... Acknowledgements The authors declare no conflicts of interest. References ...doi:10.1101/2021.01.08.425976 fatcat:7j7vkvbbfzaerp6o5wmjeyo5ri