1. Department of Pharmaceutics, School of Pharmacy; Shenyang Pharmaceutical University; No. 103 Wenhua Road Shenyang 110016 P. R. China
2. Department of Biopharmaceutics, School of Pharmacy; Shenyang Pharmaceutical University; No. 103 Wenhua Road Shenyang 110016 P. R. China
3. Key Laboratory of Drug Delivery Technology and Pharmacokinetics; Tianjin Institute of Pharmaceutical Research; Tianjin P. R. China
4. Pharmaceutical College of Henan University; Kaifeng 475004 P. R. China