1. Mehiläinen Airport Health Centre, 01530 Vantaa, Finland
2. Department of Forensic Medicine, University of Helsinki, 00014 Helsinki, Finland
3. Royal Free Hospital, Pond Street, London NW3 2QG, UK
4. Centre for Aviation Psychology, London NW3 1ND, UK
5. Forensic Medicine Unit, Finnish Institute for Health and Welfare, 00271 Helsinki, Finland