1. University Group for Interdisciplinary Psychedelic Research (HIPF), Johannes Gutenberg University, Mainz, Germany
2. Schildower Kreis, c/o Centre for Drug Research, Goethe University Frankfurt, Frankfurt, Germany
3. Delphic HSE (Europe) B.V., Schiphol, The Netherlands
4. Medical Anthropology Research Center, Universitat Rovira i Virgili, Tarragona, Spain