Authors: G X Cheng; X H Zhu; X Q Men; L Wang; Q H Huang; X L Jin; S M Xiong; J Zhu; W M Guo; J Q Chen; S F Xu; E So; L C Chan; S Waxman; A Zelent; G Q Chen; S Dong; J X Liu; S J Chen Journal: Proc Natl Acad Sci U S A Date: 1999-05-25 Impact factor: 11.205