1. Department of Pharmaceutics and Bioengineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
2. Panxi Institute of Vanadium and Titanium Inspection and Testing/National Quality Inspection Center of Vanadium and Titanium Products, Panzhihua 617000, Sichuan, China
3. College of Chemistry and Environment Protection Engineering, Southwest Minzu University, Chengdu 610041, Sichuan, China
4. Department of Urology, Institute of Urology and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610065, P. R. China