1. Department of Sport, Physical Education and Outdoor Studies, University College of Southeast Norway, Bø, Norway
2. Department of Neuroscience, The Swedish School of Sport and Health Sciences, Karolinska Institute, Stockholm, Sweden
3. Jæren Psychiatric Center, Bryne, Norway
4. Naturama Museum, Svendborg, Denmark
5. Department of Psychology, University of Southern Denmark, Odense, Denmark