1. The Key Laboratory of Dairy Biotechnology and Bioengineering, Department of Food Science and Engineering, Education Ministry of P. R. China, Inner Mongolia Agricultural University, Huhhot, P. R. China
2. Public Health College, Medical College of Baotou, Baotou, P. R. China
3. The First Affiliated Hospital, Medical College of Baotou, Baotou, P. R. China