[1] Cornell Univ, Qatar Fdn Educ City, Infect Dis Epidemiol Grp, Weill Cornell Med Qatar, Doha, Qatar
[2] Cornell Univ, Qatar Fdn Educ City, World Hlth Org Collaborating Ctr Dis Epidemiol An, Sexually Transmitted Infect & Viral Hepatitis, Doha, Qatar
[3] Qatar Univ, Acad Qual Affairs Off, Dept Publ Hlth, Coll Hlth Sci, Doha, Qatar
[4] Univ Bristol, Bristol Med Sch, Populat Hlth Sci, Bristol, Avon, England
[5] Cornell Univ, Dept Populat Hlth Sci, Weill Cornell Med, New York, NY USA