1. Department of Anesthesiology, Pain Clinic, Hannover Medical School, Hannover, Germany.
2. Department of Plastic, Aesthetic, Hand and Reconstructive Surgery, Burn Center, Hannover Medical School, Hannover, Germany.
3. Laboratory of Molecular Neuroscience, Social Psychiatry and Psychotherapy, Department of Psychiatry, Hannover Medical School, Hannover, Germany.