A bar graph titled "Bone cancer: number of patients included in the investigation (neither incidence nor prevalence) by country and sex group: 15-44 years, years of diagnosis: 1990-1994, source: SEER and Eurocare3, logarithmic scale" with two bars, one yellow and one green, representing the number of patients in the investigation by country and sex group, respectively, for the years 1990-1994.