Jonathan Jay1,2, Luke W Miratrix3, Charles C Branas4,5, Marc A Zimmerman4,6, David Hemenway4,7. 1. Department of Community Health Sciences, Boston University School of Public Health, 801 Massachusetts Avenue 4th Floor, Boston, MA, 02118, USA. jonjay@bu.edu. 2. Firearm-safety Among Children and Teens Consortium, University of Michigan School of Medicine, 1500 East Medical Center Drive, Ann Arbor, MI, 48109, USA. jonjay@bu.edu. 3. Harvard Graduate School of Education, 13 Appian Way, Cambridge, MA, 02138, USA. 4. Firearm-safety Among Children and Teens Consortium, University of Michigan School of Medicine, 1500 East Medical Center Drive, Ann Arbor, MI, 48109, USA. 5. Department of Epidemiology, Columbia Mailman School of Public Health, 722 West 168th Street, New York, NY, 10032, USA. 6. Department of Health Behavior and Health Education, University of Michigan School of Public Health, 1415 Washington Heights, Ann Arbor, MI, 48109, USA. 7. Department of Health Policy and Management, Harvard T. H. Chan School of Public Health, 677 Huntington Avenue, Boston, MA, 02115, USA.