1. Graduate Institute of Veterinary Microbiology and Public Health; National Chung Hsing University; Taichung Taiwan
2. Veterinary Teaching Hospital; National Chung Hsing University; Taichung Taiwan
3. Department of Veterinary Medicine; National Chung Hsing University; Taichung Taiwan
4. Institute of Veterinary Clinical Science; School of Veterinary Medicine; College of Bio-resources and Agriculture; National Taiwan University; Taipei Taiwan