1. Department of Biosciences, University of Oslo, Pb 1066 Blindern, Oslo NO-0316, Norway
2. Norwegian Orca Survey, Breivikveien 10, Andenes NO-8480, Norway
3. Department of Environmental Chemistry, NILU: The Climate and Environmental Research Institute, Pb 100, Kjeller NO-2027, Norway
4. Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, Pb 5003, Ås NO-1432, Norway
5. Institute of Marine Research, Fram Centre, Pb 6606 Stakkevollan, Tromsø NO-9296, Norway