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Box plots showing the variability of interlandmark distance data: L, Landmark; i, landmark number; L1, left lip commissure; L2, right lip commissure; L3, midpoint of the lower lip vermilion; L4, soft-tissue B-point; L5, nasion; L6, subnasale; L7, tip of the nose; L8, midpoint of the upper lip vermilion.
