[1] George Washington Univ, Sch Engn & Appl Sci, Dept Prevent & Community Hlth, Washington, DC USA
[2] George Washington Univ, Mliken Sch Publ Hlth, Dept Engn Management & Syst Engn, Washington, DC USA
[3] George Washington Univ, Mliken Sch Publ Hlth, Dept Biostat & Bioinformat, Washington, DC USA