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Cent South Univ, Sch Publ Hlth, Dept Epidemiol & Hlth Stat, Changsha, Hunan, Peoples R China
Univ Pittsburgh, Sch Med, Dept Pediat, Pittsburgh, PA 15261 USA Cent South Univ, Sch Publ Hlth, Dept Epidemiol & Hlth Stat, Changsha, Hunan, Peoples R China