1 Department of Health, Behavior and Society, Bloomberg School of Public Health, Johns Hopkins University, USA; Division of Infectious Diseases, Johns Hopkins University School of Medicine, USA. Electronic address: carl.latkin@jhu.edu.
2 Department of Health, Behavior and Society, Bloomberg School of Public Health, Johns Hopkins University, USA.
3 Krieger School of Arts & Sciences, Johns Hopkins University, USA.
4 Division of Community Health Sciences, University of Illinois at Chicago School of Public Health, Chicago, IL, USA.