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(a) Incidence rates by gender (20- to 39-years old). Demonstrates incidence rates assessed by sex and age groups. Shows that the dramatic peak in incidence only occurred for men 20–39 years of age. (b) Incidence rates by gender (40- to 64-years old). Demonstrates incidence rates assessed by sex and age groups. Shows that the dramatic peak in incidence only occurred for men 40–64 years of age.
