1. National Center for Posttraumatic Stress Disorder, VA Boston Healthcare System, 150 S. Huntington Ave. (116B), Boston, MA 02130, USA
2. Department of Psychology, University of Miami, 5665 Ponce de Leon Blvd, Coral Gables, FL 33146, USA
3. Department of Experimental Clinical and Health Psychology, Ghent University, Henri Dunantlaan 2, B-9000, Ghent, Belgium
4. Department of Psychology, Yale University, New Haven, CT 06511, USA