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Study follow-up period and time at risk for development of Sequela X (solid lines: unexposed time at risk; dashed lines: exposed time at risk. *For sequelae where recovery and return to being at risk is possible: this date + recovery time for Sequela X = date of return to being at risk for a subsequent occurrence of sequela X. B.C., British Columbia, Canada; DAD, Discharge Abstracts Database; MSP, Medical Services Plan; VS, Vital Statistics.
