[1] COLORADO STATE UNIV, COLL VET MED & BIOMED SCI, DEPT PATHOL, FT COLLINS, CO 80523 USA
[2] COLORADO STATE UNIV, COLL VET MED & BIOMED SCI, COLLABORAT RADIOL HLTH LAB, FT COLLINS, CO 80523 USA
[3] UNIV UTAH, SCH MED, DEPT ANAT, SALT LAKE CITY, UT 84112 USA