[1] Colorado State Univ, Coll Vet Med, Dept Clin Sci, Comparat Ophthalmol, Ft Collins, CO 80523 USA
[2] Eye Care Anim, Chicago, IL USA
[3] Colorado State Univ, Dept Stat, Coll Nat Sci, Ft Collins, CO 80523 USA
[4] Univ Minnesota UMN, Minneapolis, MN USA