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Countrywise hazard ratio (HR) for risk of revision of all THRs compared to the reference country, Sweden (HR = 1). HRs are presented in 1-year time periods, except that the first year has been divided into 2 periods. If there were less than 20 cases in the group, the HRs were not included in the graphs due to the intervals being too wide. The model was stratified by sex, age group, and diagnosis.
