1. Universitat Rovira i Virgili, Tarragona, Spain
2. International Center for Ethnobotanical Education, Research and Service, Barcelona, Spain
3. Subdirectorate General of Addictions, HIV, STI and Viral Hepatitis, Public Health Agency of Catalonia, Department of Health, Barcelona, Spain
4. Department of Psychiatry and Psychotherapy, Center for Interdisciplinary Addiction Research (ZIS), University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany