In the United States, recent population-based cohorts estimate incidence between 1.7 and 2.2 cases per 1,000 person-years, indicating a decreasing trend compared to previous decades [ 7 , 8 ].
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In the United States, recent population-based cohorts estimate incidence between 1.7 and 2.2 cases per 1,000 person-years, indicating a decreasing trend compared to previous decades [ 7 , 8 ].