1. State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu Sichuan 610041 PR China
2. West China School of Pharmacy; Sichuan University; Chengdu Sichuan 610041 China
3. Department of Pharmaceutical Sciences; University of Nebraska Medical Center; Omaha NE 68198 USA
4. College of Chemistry and Environment Protection Engineering; Southwest University for Nationalities; Chengdu Sichuan 610041 China