1. University of Tromsø – The Arctic University of Norway, Department of Physics and Technology, Technology Building, 9037 Tromsø, Norway
2. Bielefeld University, Department of Physics, Universitätsstr. 25, 33615 Bielefeld, Germany
3. University of Tromsø – The Arctic University of Norway, Department of Medical Biology, MH Building,9037 Tromsø, Norway
4. University of Tromsø – The Arctic University of Norway, Department of Medical Biology, MH Building,9037 Tromsø, Norway, e-mail: peter.mccourt@sydney.edu.au