1. Key Laboratory of Dairy Biotechnology and Engineering, Ministry of Education P. R. C., Key Laboratory of Dairy Products Processing, Ministry of Agriculture and Rural Affairs P. R. C., Inner Mongolia Agricultural University, Hohhot, P. R. China
2. College of Food Science and Engineering, Hainan University, Haikou, P. R. China
3. College of Animal Science, Qingdao Agricultural University, Qingdao, P. R. China
4. Department of General Surgery, 971 Hospital, Qingdao, P. R. China