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Landmark positions of P2; bifurcation of vessels and airway were determined by radiologists (a) locating landmarks at anatomical points of bifurcations and at the center of the tumor (tumor, arrow; LR-AP, sectional view on top; AP-SI, sectional view on bottom left; LR-SI, sectional view on bottom right); (b) 48 points of landmarks; and (c) five points of landmarks close to the tumor.
