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Ohio State Univ, Med Ctr, Columbus, OH 43210 USA
Ohio State Univ, Coll Med, Dept Internal Med, Div Canc Prevent & Control, Columbus, OH 43210 USA
Ohio State Univ, Coll Publ Hlth, Div Epidemiol, Columbus, OH 43210 USA Ain Shams Univ, Fac Med, Cairo, Egypt