A validated grading scale for crow's feet.
Carruthers A, Carruthers J, Hardas B, Kaur M, Goertelmeyer R, Jones D, Rzany B, Cohen J, Kerscher M, Flynn TC, Maas C, Sattler G, Gebauer A, Pooth R, McClure K, Simone-Korbel U, Buchner L.
Carruthers A, et al.
Dermatol Surg. 2008 Nov;34 Suppl 2:S173-8. doi: 10.1111/j.1524-4725.2008.34367.x.
Dermatol Surg. 2008.
PMID: 19021676