Fig. 1From: Loss of skin elasticity is associated with pulmonary emphysema, biomarkers of inflammation, and matrix metalloproteinase activity in smokersMeasurement of facial wrinkling. Daniell system for scoring the appearance of facial wrinkles in the crow’s-foot area: 1) Essentially unwrinkled. 2) Between 2 and 6 wrinkles ≤3 cm in length. 3) Several prominent wrinkles 3-4 cm in length. 4) Wrinkles ≥5 cm in length, may extend onto cheek area. 5) Prominent wrinkles extending from crow’s-foot area over cheeks and forehead. 6) Profound wrinkling over most of the faceBack to article page