Protocol for a qualitative mechanistic study of MDMA with a sample of psychoanalytic psychotherapists: A phenomenological investigation - Elisa Liberati; H. Valerie Curran; Peter Fonagy; Henry Clements; Alessandra Lemma; Rosalind McAlpine; David J. Nutt; Anne Katrin Schlag; Sunjeev K. Kamboj (PLoS ONE, 2026)