1. Faculty of Psychology, University of Basel, Basel, Switzerland
2. Clinic for Neurorehabilitation and Paraplegiology, REHAB Basel, Basel, Switzerland
3. Clinic and Polyclinic for Internal Medicine, University Hospital Zürich, Zürich, Switzerland
4. Biomedical Optics Research Laboratory, University Hospital Zürich, Zürich, Switzerland
5. Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland