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Comparison of psychedelic and near-death or other non-ordinary experiences in changing attitudes about death and dying
Survey of entity encounter experiences occasioned by inhaled N,N-dimethyltryptamine: Phenomenology, interpretation, and enduring effects
Double-blind comparison of the two hallucinogens psilocybin and dextromethorphan: effects on cognition
Double-blind comparison of the two hallucinogens psilocybin and dextromethorphan: similarities and differences in subjective experiences