CJCP     2002 4 (4):  300-302    ISSN: 1008-8830  CN: 43-1301/R LIU Li-Zhen, TANG Suo-Qin, ZHANG Xiao-Fei, HUANG Dong-Sheng, WANG Jian-Wen Received: null  Revised: null  Online: null Supporting info