1. Department of Psychosomatic Medicine and Psychotherapy , Otto-von-Guericke University , Magdeburg , Germany
2. Department of Surgery , Otto-von-Guericke University , Magdeburg , Germany
3. Department of Psychiatry and Psychotherapy , University Hospital Jena Friedrich Schiller University , Jena , Germany
4. Department of Orthopaedic Surgery , Otto-von-Guericke University , Magdeburg , Germany