Microdosing psilocybin for major depressive disorder: study protocol for a phase II double-blind placebo-controlled randomised partial crossover trial. - Beidas, Zeina; Ragnhildstveit, Anya; Blackman, Adam; Anderson, Thomas; Fewster, Emily; Syed, Omer A.; Sobolenko, Valentyne; Kanca, Ismail Kaan; Jaglinska, Magdalena; Son, Tatiana; Farb, Norman; Petranker, Rotem (BJPsych Open, 2026)