1. Laboratory of Veterinary Internal Medicine, College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Korea
2. Veterinary Pharmaceutical Management Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea
3. Laboratory of Veterinary Obstetrics, College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Korea