"We regard MPD as a dissociate phenomenon of exceedingly rare occurrence if it occurs at all. Unsurprisingly, it seems related to hypnotizability. The accentuation and "epidemic" of this rare, iatrogenic disorder does no justice to scientific psychiatry, generating media and literature distortions and misinformation. It distressingly often provides untenable and flamboyant legal defense maneuvers for serial killers and others of ill repute. Psychiatry should not reinforce the mystical and bizarre."
From Seymour Tozman & Roman Padis, "MPD: Further Skepticism (Without Hostility… We Think)", 177 J. Nervous & Mental Disease 708 (1989) (Letter to editor).