Huppert, J. D. ; Schultz, L. T. ; Foa, E. B. ; Barlow, D. H. ; Davidson, J. R. T. ; Gorman, J. M. ; Shear, K. M. ; Simpson, B. H. ; Woods, S. W. . Differential Response To Placebo Among Patients With Social Phobia, Panic Disorder, And Obsessive-Compulsive Disorder. American Journal of Psychiatry 2004.