[1] Johns Hopkins Aramco Healthcare, Dhahran 31311, Saudi Arabia
[2] Indiana Univ Sch Med, Indianapolis, IN 46202 USA
[3] Minist Hlth, Riyadh 1151, Saudi Arabia
[4] Emory Univ, Rollins Sch Publ Hlth, Hubert Dept Global Hlth, Atlanta, GA 30322 USA
[5] Alfaisal Univ, Coll Med, POB 54146, Riyadh 11514, Saudi Arabia