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Landmarks used in (a) the first study and (b) the second study: 1, left outer canthion; 2, left pupil centre; 3, left inner canthus; 4, right inner canthus; 5, right pupil centre; 6, right outer canthus; 7, glabella; 8, nasion; 9, sellion; 10, left cheilion; 11, right cheilion; 12, left crista philtre; 13, labiale superius; 14, right crista philtre; 15, stomion; 16, subnasale; 17, midpoint of philtrum furrow; 18, left alare; 19, right alare; 20, pronasale.
