1. Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, MB R3T 2N6, Canada.
2. Marine Mammal Research Unit, Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
3. LGL Limited, 22 Fisher Street, P.O. Box 280, King City, ON L7B 1A6, Canada.
4. Animal Health Center, 1767 Angus Campbell Road, Abbotsford, BC V3G 2M3, Canada.
5. P.O. Box 265, Pangnirtung, NU X0A 0R0, Canada.
6. Department of Biological Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.