1. Department of Neuroscience McMaster University Hamilton ON Canada
2. Department of Psychology, Neuroscience and Behaviour McMaster University Hamilton ON Canada
3. Brain Imaging Center Frankfurt am Main Germany
4. Department of Sports Medicine Institute of Sports Sciences Goethe University Frankfurt am Main Germany
5. Institute of Neuroradiology Goethe University Hospital Frankfurt Frankfurt am Main Germany
6. Neurobiology and Neurotrophins Laboratory Department of Psychiatry and Psychotherapy Charité University Medicine Berlin Berlin Germany
7. Division of Preventive and Sports Medicine Institute of Occupational, Social and Environmental Medicine Goethe-University Frankfurt Germany
8. Institute of General Practice Goethe University Frankfurt am Main Germany