[1] NCI, Ctr Canc Res, NIH, Bethesda, MD 20892 USA
[2] Univ Montreal, Fac Med Vet, Dept Pathol & Microbiol, Canadian Wildlife Hlth Cooperat, St Hyacinthe, PQ, Canada
[3] GREMM, Tadoussac, PQ, Canada
[4] Fisheries & Oceans Canada, Inst Freshwater, Winnipeg, MB, Canada
[5] Univ British Columbia, Marine Mammal Res Unit, Ctr Anim Hlth, Abbotsford, BC, Canada
[6] Sea World San Diego, San Diego, CA USA
[7] A Watson Armour III Ctr Aquat Anim Hlth & Welf, John G Shedd Aquarium, Chicago, IL USA
[8] Univ Illinois, Coll Vet Med, Zool Pathol Program, Brookfield, IL USA
[9] Alaska Vet Pathol Serv, Eagle River, AK USA
[10] North Slope Borough, Dept Wildlife Management, Barrow, AK USA
[11] Univ Alaska Fairbanks, Inst Arctic Biol, Fairbanks, AK USA
[12] Univ Louisville, Sch Med, Dept Pharmacol & Toxicol, Wise Lab Genet & Environm Toxicol, Louisville, KY 40292 USA