1. De Vonk, Center '45, National Centre for the Treatment of World War II Victims, Noordwijkerhout, The Netherlands
2. Department of Psychiatry, St. Lucas/Andreas Hospital, Amsterdam
3. Department of Medical Psychology, University of Limburg, School of Medicine, Maastricht
4. Centre for Sleep/Wake Disorders, Kempenhaege, Heeze
5. Department of Clinical Neurophysiology, St. Lucas/Andreas Hospital, Amsterdam
6. Trauma Research, Consultancy and Training, Amsterdam