1. Beijing Key Laboratory of Traditional Chinese Veterinary Medicine, Beijing University of Agriculture, Beijing 102206, P.R. China
2. Department of Biology, Tennessee Center for Botanical Medicine Research, Middle Tennessee State University, Murfreesboro, TN 37132‑0001, USA
3. College of Veterinary Medicine, China Agricultural University, Beijing 100083, P.R. China
4. School of Chinese Herbal Medicine, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China