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Position of landmarks placed on the face. A, Landmarks used were the bilateral medial canthus, lateral canthus, glabella, nasal tip, subnasale, right and left alar, columella, philtral crest, labrale inferious, right and left oral commissure, and menton. B, examples of the markings used for the MRD1, MRD2, and the intracanthal distance on a patient.
