1. German Association for ME/CFS, 20146 Hamburg, Germany
2. Research Center CATALPA, FernUniversität in Hagen, 58097 Hagen, Germany
3. Center for Community Research, DePaul University, Chicago, IL 60614, USA
4. Institute of Medical Immunology, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt Universität zu Berlin and Berlin Institute of Health (BIH), 10117 Berlin, Germany