Comparison of acute effects of 3,4-methylenedioxymethamphetamine (MDMA) with and without a supplemental booster dose in healthy participants: a double-blind, randomized, placebo-controlled, crossover study. - Humbert-Droz M; Becker AM; Valenta J; Rudin D; Luethi D; Vukalovic I; Eckert A; Liechti ME; Mueller L (Translational psychiatry, 2026)