[1] Univ S Carolina, Arnold Sch Publ Hlth, Dept Epidemiol & Biostat, Columbia, SC 29208 USA
[2] Univ S Carolina, Canc Prevent & Control Program, Columbia, SC 29208 USA
[3] Univ S Carolina, Coll Nursing, Columbia, SC 29208 USA
[4] Univ Texas Med Branch, Sealy Ctr Aging, Galveston, TX 77555 USA
[5] Houston Methodist, Dept Radiol, Houston, TX USA