Psilocybin-assisted massed cognitive processing therapy for chronic posttraumatic stress disorder: Protocol for an open-label pilot feasibility trial - Shakila Meshkat; Richard J. Zeifman; Kathleen Stewart; Reinhard Janssen-Aguilar; Wendy Lou; Rakesh Jetly; Candice M. Monson; Venkat Bhat (PLoS ONE, 2025)