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Recommendation on clinical target volume delineation for crossing-segments thoracic ESCC. (A) Ut-Mt; (B) Mt-Ut; (C) Mt-Lt; (D) Lt-Mt. Ut-Mt, upper-middle thoracic tumor; Mt-Ut, middle-upper thoracic tumor; Mt-Lt, middle-lower thoracic tumor; Lt-Mt, lower-middle thoracic tumor.
