Developmental Pathways to Dissociation

Is early trauma the root cause of dissociative disorders?
Most of the literature and research on dissociation focuses on trauma as the root cause of dissociative disorders, and many studies show an association between dissociation and trauma (Putnam, 1997). “The fact that nontraumatized individuals sometimes demonstrate dissociation and that not all trauma survivors dissociate suggests that there may be more to the etiology and development of dissociation than trauma alone.” (Dutra, Bianchi, Siegel and Lyons-Ruth, 2009, p. 84). If early trauma is not the unique cause of dissociation, then what else could cause it?