1. Laboratory of Veterinary Internal Medicine, BK21 PLUS Program for Creative Veterinary Science Research, and Research Institute for Veterinary Science, College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea.
2. College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA.
3. Department of Environmental Medical Biology, Yonsei University College of Medicine, Seoul 03722, Korea.