Long-term follow-up of psilocybin-assisted psychotherapy for psychiatric and existential distress in patients with life-threatening cancer - Gabrielle Agin-Liebes; Tara C. Malone; Matthew M. Yalch; Sarah E. Mennenga; Katherine Ponte; Jeffrey Guss; Anthony P. Bossis; Jim Grigsby; Stacy M. Fischer; Stephen Ross (Journal of Psychopharmacology, 2020)