1. Department of Psychology, Norwegian University of Science and Technology, Trondheim, Norway
2. Institute of Military Psychiatry, Norwegian Armed Forces Joint Medical Services, Oslo, Norway
3. Department of Psychology, University of Oslo, Oslo, Norway
4. Center for the Study of Traumatic Stress, Department of Psychiatry, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
5. Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, Maryland, USA