1 Department of Prevention and Community Health, Milken Institute School of Public Health, George Washington University, Washington, DC, USA.
2 Department of Global Health, Milken Institute School of Public Health, George Washington University, Washington, DC, USA.
3 Paul Himmelfarb Health Sciences Library, School of Medicine & Health Sciences, George Washington University, Washington, DC, USA.
4 Department of Prevention and Community Health, Milken Institute School of Public Health, George Washington University, Washington, DC, USA. ttaggart@gwu.edu.
5 Department of Social and Behavioral Sciences, Yale University, New Haven, CT, USA. ttaggart@gwu.edu.