[1] Johns Hopkins Aramco Healthcare, Specialty Internal Med & Qual Dept, Dhahran, Saudi Arabia
[2] Indiana Univ Sch Med, Dept Med, Infect Dis Div, Indianapolis, IN 46202 USA
[3] Johns Hopkins Univ, Sch Med, Dept Med, Infect Dis Div, Baltimore, MD 21218 USA
[4] King Saud Univ, Dept Family & Community Med, Riyadh, Saudi Arabia
[5] Univ Cient, Clin Epidemiol & Biostat, Lima 4861, Peru
[6] Lebanese Amer Univ, Gilbert & Rose Marie Chagoury Sch Med, Beirut 1102, Lebanon
[7] King Saud Univ Med City, Dept Pediat, Riyadh, Saudi Arabia