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.