[1] Amer Univ Beirut, Med Ctr, Employee Hlth Unit, Beirut, Lebanon
[2] Amer Univ Beirut, Fac Hlth Sci, Med Lab Sci Program, Beirut, Lebanon
[3] Amer Univ Beirut, Fac Med, Beirut, Lebanon
[4] Amer Univ Beirut, Med Ctr, Infect Prevent & Control Program, Beirut, Lebanon
[5] Yale Univ, Sch Med, Yale Occupat & Environm Med Program, New Haven, CT USA
[6] Amer Univ Beirut, Med Ctr, Dept Internal Med, Div Infect Dis, Beirut, Lebanon
[7] Amer Univ Beirut, Fac Med, Dept Family Med, Employee Hlth Unit, Beirut, Lebanon