1. Gunderson Personality Disorders Research Institute, McLean Hospital, Belmont, Massachusetts (Traynor, Choi-Kain); Faculty of Medicine, Harvard Medical School, Boston (Traynor, Choi-Kain); Langone Center for Psychedelic Medicine, Department of Psychiatry, New York University Grossman School of Medicine, New York (Roberts, Ross); Department of Psychology, Ryerson University, Toronto (Zeifman); Centre for Psychedelic Research, Imperial College London, London (Zeifman).