Zwanzger, P., Eser, D., Padberg, F., Baghai, T. C., Schule, C., Rupprecht, R., di Michele, F., Romeo, E., Pasini, A., & Ströhle, A. (2004). Neuroactive steroids are not affected by panic induction with 50 mu g cholecystokinin-tetrapeptide (CCK-4) in healthy volunteers. Journal of Psychiatric Research, 38(2), 215-217.