Psilocybin for Treatment of Prolonged Grief Disorder: An Open-Label Feasibility Study Protocol. - Penberthy, J. Kim; A. Wise, Fatma; Cherup, Nicholas; Penberthy, J. Morgan; Mitchell, Evaline; Burns, Madeline; Akinlade, Oluwafunmilayo; Chung, David; Parmar, Harshit; Singer, Jonathan (Psychoactives, 2026)