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Dan J. Stein is Professor and Chair of the Dept of Psychiatry and Mental Health at the University of Cape Town, and Director of the MRC Unit on Anxiety and Stress Disorders. His research interests include the psychobiology and management of the anxiety, obsessive-compulsive and related disorders, and traumatic and stress disorders. He also served as Chair of the DSM-5 Sub-work Group on Obsessive-Compulsive Spectrum Disorders.