1. Section of Diagnostic Imaging, School of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon 201-100, Korea.
2. Section of Wildlife Medicine, School of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon 201-100, Korea.
3. Section of Small Animal Internal Medicine, School of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon 201-100, Korea.
4. Section of Obstetrics, College of Veterinary Medicine, Chonnam National University, Gwangju 500-757, Korea.