1. BG University Hospital Bergmannsheil GmbH, Ruhr University Bochum; Department of Pain Medicine; Cample-de-la Bürk Platz 1 Bochum Germany 44789
2. University of Duisburg-Essen; Department of Internal and Integrative Medicine, Kliniken Essen-Mitte, Faculty of Medicine; Am Deimelsberg 34 a Essen Germany D-45276
3. University of Saskatchewan; School of Physical Therapy; 104 Clinic Place Saskatoon SK Canada S7N 2Z4
4. Cardiff University School of Medicine; Section of Rheumatology, Division of Infection and Immunity; Tenovus Building Heath Park Cardiff UK CF14 4XN
5. Technische Universität München; Department of Psychosomatic Medicine and Psychotherapy; Langerstr. 3 München Germany D-81675