[1] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Environm Hlth Sci, Baltimore, MD 21205 USA
[2] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Epidemiol, Baltimore, MD 21205 USA
[3] Johns Hopkins Med Inst, Dept Otolaryngol Head & Neck Surg & Med, Baltimore, MD 21205 USA
[4] Johns Hopkins Med Inst, Welch Ctr Prevent Epidemiol & Clin Res, Baltimore, MD 21205 USA
[5] Johns Hopkins Bloomberg Sch Publ Hlth, George W Comstock Ctr Publ Hlth Res & Prevent, Hagerstown, MD USA
[6] Med Univ S Carolina, Hollings Canc Ctr, Charleston, SC 29425 USA
[7] Med Univ S Carolina, Dept Biostat Bioinformat & Epidemiol, Charleston, SC 29425 USA