1. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China.
2. School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
3. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
4. Department of Gastroenterology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200336, P. R. China.