[1] Old Dominion Univ, Coll Hlth Sci, Sch Community & Environm Hlth, Norfolk, VA 23529 USA
[2] Tulane Univ, Sch Publ Hlth & Trop Med, Dept Environm Hlth Sci, New Orleans, LA 70112 USA
[3] Tulane Univ, Sch Engn, Dept Civil & Environm Engn, New Orleans, LA 70118 USA
[4] Louisiana State Univ, Dept Hlth & Hosp, Cent Lab, New Orleans, LA 70112 USA