1. Center for Psychedelic Drug Research and Education, The Ohio State University, Columbus, Ohio
2. Center for Psychedelic and Consciousness Research, Johns Hopkins University, Baltimore, Maryland
3. The Mission Within, Baja California, Mexico
4. US Department of Veterans Affairs, Michael E. DeBakey Veterans Administration Medical Center, Houston, TX, USA
5. Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA