1. Department of Biological Sciences, University of North Texas, Denton, TX 76203, USA
2. Comparative Medicine Laboratory, Department of Clinical Medicine, Aarhus University Hospital, Skejby, DK-8200, Denmark
3. Zoophysiology, Department of Biosciences, University of Aarhus, DK-8000 Aarhus C, Denmark
4. Department of Clinical Engineering, Aarhus University Hospital, Skejby, DK-8200 Aarhus N, Denmark