1. Department of Psychiatry Columbia University Vagelos College of Physicians and Surgeons New York New York USA
2. Department of Epidemiology Columbia University, Mailman School of Public Health New York New York USA
3. Division of Child and Adolescent Psychiatry New York State Psychiatric Institute New York New York USA
4. Department of Social and Preventive Medicine, Center for Public Health, Unit Suicide Research & Mental Health Promotion Medical University of Vienna Vienna Austria
5. Wiener Werkstaette for Suicide Research Vienna Austria