1. National Marine Mammal Foundation, 2240 Shelter Island Drive #200, San Diego, California 92106, USA
2. U.S. Navy Marine Mammal Program, Space and Naval Warfare Systems Center Pacific, Code 71510, 53560 Hull Street, San Diego, California 92152, USA
3. Coastal Ocean Research Institute, Vancouver Aquarium, 845 Avison Way, Vancouver, British Columbia V6G 3E2, Canada
4. Department of Rehabilitation Science, University at Buffalo, 626 Kimball Tower, Buffalo, New York 14214, USA