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Forest plot describing the association between OS and (< circa 50 Gy vs ≥ circa 50 Gy) subgroup (A), (54 Gy vs 70 Gy) subgroup (B), (50–50.4 Gy vs ≥ 60 Gy) subgroup (C) and (< 60 Gy vs ≥ 60 Gy) subgroup (D). * ≥ 75 years cohort; # < 75 years cohort.
