[1] Uniformed Serv Univ Hlth Sci, Dept Prevent Med & Biostat, Bethesda, MD USA
[2] Uniformed Serv Univ Hlth Sci, Ctr Hlth Serv Res, Bethesda, MD USA
[3] Henry M Jackson Fdn Advancement Mil Med Inc, Bethesda, MD USA
[4] Uniformed Serv Univ Hlth Sci, Dept Prevent Med & Biostat, 4301 Jones Bridge Rd, Bethesda, MD 20814 USA