1. College of Animal Science & Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, PR China
2. Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu 211198, PR China
3. College of Pharmacy, Gachon University, Hambakmoero, Yeonsu-gu, Incheon 406-799, Republic of Korea