1. Zoophysiology, Department of Bioscience, Aarhus University, Aarhus C, Denmark;
2. Department of Cardiology, Örebro University Hospital, Örebro, Sweden;
3. Department of Forestry and Wildlife Management, Campus Evenstad, Hedmark University College, Elverum, Norway; and
4. Institut Pluridisciplinaire Hubert Curien, Departement d'Ecologie Physiologie et Ethologie, UMR 7178, Centre National Recherche Scientifique, Strasbourg, France