[1] Emory Univ, Aflac Canc & Blood Disorders Ctr, 2015 Uppergate Dr, Atlanta, GA 30322 USA
[2] Auburn Univ, Auburn, AL 36849 USA
[3] Univ Alabama Birmingham, Div Pediat Hematol Oncol, Birmingham, AL USA
[4] Univ Alabama Birmingham, Dept Epidemiol, Birmingham, AL USA