Killgore WD, Britton JC, Schwab ZJ, Price LM, Weiner MR, Gold AL, Rosso IM, Simon NM, Pollack MH, Rauch SL. Cortico-limbic responses to masked affective faces across ptsd, panic disorder, and specific phobia. Depress Anxiety. 2014 Feb; 31(2):150-9.