[1] MICHIGAN STATE UNIV, DEPT ANIM HUSB, E LANSING, MI 48823 USA
[2] MICHIGAN DEPT NAT RESOURCES, ROSE LAKE WILDLIFE RES CTR, E LANSING, MI 48823 USA
[3] MICHIGAN DEPT NAT RESOURCES, HOUGHTON LAKE WILDLIFE RES STN, HOUGHTON LAKE HTS, MI 48630 USA
[4] MICHIGAN STATE UNIV, DEPT PATHOL, E LANSING, MI 48823 USA