1. Johns Hopkins School of Medicine, Baltimore, Maryland (Mr Majid, Ms Schumann, Ms Doswell, Ms Sutherland, Dr Golden, Dr Stewart, Dr Hill-Briggs)
2. University of Maryland, Baltimore County, Baltimore, Maryland (Ms Schumann)
3. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland (Dr Golden)
4. Department of Health, Behavior, and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland (Dr Hill-Briggs)