CJCP     2002 4 (4):  303-304    ISSN: 1008-8830  CN: 43-1301/R LIU Jian-An, LIU De-Hua, JING Jin, YI Huan-Qiong, WANG Meng-Long, CHEN Xue-Bin Received: null  Revised: null  Online: null Supporting info