[1] Johns Hopkins Bloomberg Sch Publ Hlth, Hlth Behav & Soc, Baltimore, MD USA
[2] Ohio State Univ, Coll Med, Columbus, OH 43210 USA
[3] Emory Univ, Rollin Sch Publ Hlth, Epidemiol, Atlanta, GA 30322 USA
[4] ViiV Healthcare, Res Triangle Pk, NC USA
[5] Univ North Carolina Chapel Hill, Chapel Hill, NC USA