1. Institute of Quality Standards & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing 100081, P. R. China
2. College of Animal Medicine, Shanxi Agricultural University, Jinzhong 030801, P. R. China
3. Key Laboratory of Agri-food Quality and Safety, Ministry of Agriculture, Beijing 100081, P. R. China
4. Institute for Laboratory Animal Research, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, P. R. China