1. a Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , P.R. China
2. c Harbin Pharmaceutical Group CO., LTD. General Pharm. Factory , Harbin , P.R. China
3. b Aerospace 731 Hospital , Beijing , P.R. China
4. d First Hospital of Jilin University , Changchun , P.R. China