[1] Harvard Univ, Sch Publ Hlth, Program Populat Genet, Boston, MA 02115 USA
[2] Anhui Univ, Inst Biomed, Hefei, Anhui, Peoples R China
[3] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
[4] Univ Illinois, Sch Publ Hlth, Ctr Populat Genet, Chicago, IL 60680 USA