1. Department of Psychiatry, Social Psychiatry and Psychotherapy; Hannover Medical School; Hannover; Germany
2. Pain Clinic, Department of Anesthesiology; Hannover Medical School; Hannover; Germany
3. School of Pharmacy and Biomolecular Sciences; Liverpool John Moores University; Liverpool; UK
4. Laboratory for Integrative Psychiatry; Division of Alcohol and Drug Abuse, Harvard Medical School; McLean Hospital; Belmont; MA; USA