1 The Clinical Department, College of Veterinary Medicine, China Agricultural University, Beijing, 100193 China ; Laboratory of Cancer Genetics, The University of Minnesota Hormel Institute, Austin, MN 55912 USA.
2 Laboratory of Cancer Genetics, The University of Minnesota Hormel Institute, Austin, MN 55912 USA.
3 The Clinical Department, College of Veterinary Medicine, China Agricultural University, Beijing, 100193 China.