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Trends in 10‐year relative survival rates (A) and Kaplan‐Meier survival analyses (B) for patients with osteosarcoma at 18 SEER sites from 1984 to 1993 (orange), 1994‐2003 (blue), and 2004‐2013 (black) according to age group (total and age 0‐9, 10‐19, and 20‐29 years) and calendar period
