1. Department of Psychiatry Columbia University New York New York USA
2. Department of Epidemiology Columbia University New York New York USA
3. Departments of Psychiatry and Pediatrics Center for the Study and Prevention of Suicide University of Rochester Medical Rochester New York USA
4. Department of Psychiatry and Behavioral Science Northwestern University Chicago Illinois USA
5. Department of Biostatistics and Computational Biology University of Rochester Rochester New York USA
6. Data and Research Team, Crisis Text Line New York New York USA